Method 1 doesn't consider the fact that the same train can be reused, ie. Have journey from A to B and then B to A. So in reality to carry the assumed number of passengers, less than 200 trains will be needed. Please correct me if I am wrong.
Isn't this approach valid only during the 1st hour of operation? Cz at any point of the day, by the time a train starts from the source, a train has already left from the destination after completing the trip. Hence, we actually don't have to multiply the answer by 2 for the return journey. Plz Clarify
The guesstimate only makes sense for the second bit you presented the first approach seems too mechanical in nature which is good that you showed which way not to go. Thanks for all the videos
Hey Aaditya. Before I watched your video, I created my own structure - and it ended up being what you did in the second part of the video. I believe if we were to consider these techniques in a practical sense, the second method makes more sense if we already have the data for number of lines and schedules - which would be easily available to a consultant from the train company. When I completed this approach alone, I assumed Delhi to be a 10x10mile square, with a station every mile, and 8 train lines - dividing the square into 8 slices. I ended up with peak time no. trains to be 160 - close to 200 you got from the first technique. However, this square would be unnecessary if our client also gave us information for #stations and #miles between stations. The first technique would me more useful if our client was entering a new market, e.g. looking at a new town to build a metro, and estimating how many trains we would need. In this situation we would probably also do a comps analysis, comparing other cities with similar populations, traffic problems, industry (e.g. tech vs manufacturing inthe city). What do you think?
Can we have another solution: + Consider there are 10 lines ( yellow, violet, magenta etc.) + Let the time taken by each train from start to destination for each line is on average 1 hour. + For any station, train arrives every 6 mins on average. + So, 10 trains are running from start to end in each line( 60 mins ÷ 6 mins). So, 20 trains are running in each line( 10 trains × 2, from start to end & end to start points) +As there are 10 lines, total no. of trains are 200( 20 trains × 10 lines). Any mistakes/corrections, please comment.
Why don't you just consider 3 hours per day as peak hours and the rest of the operating time as normal hours (2/3 of the peak capacity); then considering travel of each metro of 90 minutes and a gap off 2 minutes between each each metro, we get 45 metros on one track.. ( this would take take care of the metros under maintenance during normal hours or you could consider that 20% metros are under maintenance always ans add the numbers).. similarly for 5-6 other "metro lines" varying their periodicity you can arrive at a probable answer.. What say?
Hey can we give the like we have 7 lines in overall in delhi metro so each train comes after each 5 minute and metro service start in morning 5 and on an average its stop 11 so 18 hour then 5*18 = 90 it mean 90 train run in each line and we have 7 lines so 7*90 =630 ttain run in a day keep all assumption with u.
Your voice is very bleak. Can you please invest in good quality mic. Just a suggestion🙂 Your guestimates are really good. I have my interview with Urban Company today and I am learning from your videos. Thanks!
I have another approach - Delhi Metro's working hours are 6 AM to 11:30 PM. Except for Airport Line which works from 4:00 AM to 12 PM. The total number of lines are 7 (red, yellow, blue, magenta, pink, green and airport). These lines have varied frequencies so for red, yellow, blue, magenta and pink we can take the avg. frequency to be 3 minutes. But for Green and Airport line it would have to be 8 minutes. The total working hours of 5 lines is roughly 18 hours. 18 * 60 * 5/3 = 1800 trips. Then, for the other two lines Green = 18 * 60/8 = 135 trips Airport = 20 * 60/8 = 150 trips Each trip roughly takes 1.5 hours. 2085/1.5 = 1390 trains. Is that okay?
Solving these questions is always difficult so the approach should start with the knowledge you have. So i know that it takes 2 hours to reach Huda city centre from Noida city centre. Assume that average time between any 2 consecutive station is 5 mins. Assume that the time interval between 2 trains is around 3-4 minutes. And we know that after every 4 hours, the same train will arrive at a particular station , on a particular side. Therefore, number of metros= (17 hours(6am to 11pm) x 60)/(3*24/4)=57 , assume 60 trains. The smallest line is the airport line which can have a max of 10 trains. There are total 9 metro lines. Average number of train per line= (60+10)/2=35 Therefore total=9*35=315 trains
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Method 1 doesn't consider the fact that the same train can be reused, ie. Have journey from A to B and then B to A. So in reality to carry the assumed number of passengers, less than 200 trains will be needed. Please correct me if I am wrong.
Isn't this approach valid only during the 1st hour of operation? Cz at any point of the day, by the time a train starts from the source, a train has already left from the destination after completing the trip. Hence, we actually don't have to multiply the answer by 2 for the return journey.
Plz Clarify
you can also clarify whether new lines are included or not.
The guesstimate only makes sense for the second bit you presented the first approach seems too mechanical in nature which is good that you showed which way not to go. Thanks for all the videos
Hey Aaditya. Before I watched your video, I created my own structure - and it ended up being what you did in the second part of the video.
I believe if we were to consider these techniques in a practical sense, the second method makes more sense if we already have the data for number of lines and schedules - which would be easily available to a consultant from the train company. When I completed this approach alone, I assumed Delhi to be a 10x10mile square, with a station every mile, and 8 train lines - dividing the square into 8 slices. I ended up with peak time no. trains to be 160 - close to 200 you got from the first technique. However, this square would be unnecessary if our client also gave us information for #stations and #miles between stations.
The first technique would me more useful if our client was entering a new market, e.g. looking at a new town to build a metro, and estimating how many trains we would need. In this situation we would probably also do a comps analysis, comparing other cities with similar populations, traffic problems, industry (e.g. tech vs manufacturing inthe city).
What do you think?
The logic behind 15% please
thnks bro
Why did we multiply by 2/3 ?? Somebody pls explain
Can we have another solution:
+ Consider there are 10 lines ( yellow, violet, magenta etc.)
+ Let the time taken by each train from start to destination for each line is on average 1 hour.
+ For any station, train arrives every 6 mins on average.
+ So, 10 trains are running from start to end in each line( 60 mins ÷ 6 mins). So, 20 trains are running in each line( 10 trains × 2, from start to end & end to start points)
+As there are 10 lines, total no. of trains are 200( 20 trains × 10 lines).
Any mistakes/corrections, please comment.
first, tell me whether the trick shown in link is workable or not regarding metro saving
th-cam.com/video/DCo8o4q_GNA/w-d-xo.html
@@ritvikkaran967 i think its workable, but risk is huge.
Your approach is exactly what he explained in his strategy 2 but your explanation is much easier. So, thanks man! :D
you have consider for peak hours only
Why don't you just consider 3 hours per day as peak hours and the rest of the operating time as normal hours (2/3 of the peak capacity); then considering travel of each metro of 90 minutes and a gap off 2 minutes between each each metro, we get 45 metros on one track.. ( this would take take care of the metros under maintenance during normal hours or you could consider that 20% metros are under maintenance always ans add the numbers).. similarly for 5-6 other "metro lines" varying their periodicity you can arrive at a probable answer.. What say?
Hey can we give the like we have 7 lines in overall in delhi metro so each train comes after each 5 minute and metro service start in morning 5 and on an average its stop 11 so 18 hour then 5*18 = 90 it mean 90 train run in each line and we have 7 lines so 7*90 =630 ttain run in a day keep all assumption with u.
Why he made it so difficult! 😢
hahah exactly
Your voice is very bleak. Can you please invest in good quality mic. Just a suggestion🙂 Your guestimates are really good. I have my interview with Urban Company today and I am learning from your videos. Thanks!
I have another approach -
Delhi Metro's working hours are 6 AM to 11:30 PM. Except for Airport Line which works from 4:00 AM to 12 PM.
The total number of lines are 7 (red, yellow, blue, magenta, pink, green and airport).
These lines have varied frequencies so for red, yellow, blue, magenta and pink we can take the avg. frequency to be 3 minutes. But for Green and Airport line it would have to be 8 minutes.
The total working hours of 5 lines is roughly 18 hours. 18 * 60 * 5/3 = 1800 trips. Then, for the other two lines
Green = 18 * 60/8 = 135 trips
Airport = 20 * 60/8 = 150 trips
Each trip roughly takes 1.5 hours. 2085/1.5 = 1390 trains.
Is that okay?
you are assuming that every trip is taken by a different metro
I think 1390 is number of trips
Solving these questions is always difficult so the approach should start with the knowledge you have.
So i know that it takes 2 hours to reach Huda city centre from Noida city centre.
Assume that average time between any 2 consecutive station is 5 mins.
Assume that the time interval between 2 trains is around 3-4 minutes.
And we know that after every 4 hours, the same train will arrive at a particular station , on a particular side.
Therefore, number of metros= (17 hours(6am to 11pm) x 60)/(3*24/4)=57 , assume 60 trains.
The smallest line is the airport line which can have a max of 10 trains.
There are total 9 metro lines.
Average number of train per line= (60+10)/2=35
Therefore total=9*35=315 trains
Can you please explain the '3*24/4' part in denominator
I lost you after 2 min
Can't take my eyes off his tongue and concentrate
he moves it so much don't know why???
Toh mat dekh anpadh aurat.
poor voice quality
Audio quality is not good