I thought about it for a while, and figuring that 60 mph is 1 mile per minute, with some mental juggling I came up with 40 mph. Instead of checking it with my trusty HP-51C, I whipped out my Computer, Dead Reckoning, AN5835-1, which is a WW2 vintage predecessor of the ubiquitous E6B flight computer. I rotated the dial, put 18 minutes under 12 miles. The index marker pointed at 40. Awright!
Why not 12/18 = x/60. Cross multiply and you get 720 = 18x. Then you divide both sides by 18 and you get x = 40. That means you travel 40 miles in 60 minutes or 1 hour!
Changing units, here we go. So, we have a train that goes 12 miles in 18 minutes. In order to get their speed in MPH, we need to remember there are 60 minutes in an hour, so our conversion factor will be: 60 min / 1 hr Now all we need to do is multiply: 12 miles / 18 min * 60 min / 1 hr = 2 miles / 1 min * 20 min / 1 hr = 2 miles / 1 * 20 / 1 hr = 40 miles / 1 hr = 40 MPH Now, you may notice that certain numbers may be easy to calculate portions of another number, but that may not always be the case. Using conversion factors like we have above is a sure fire way to always solve these.
easiest way I figured this out was to take the 18 minutes and figure when it was an even number of hours..... could simply see 10 X 18 = 180 minutes which was 3 hours. Multiple the twelve by the same ..... 10 X 12 = 120 miles.... 120 miles in 3 hours was 120/3 = 40 mph. Took me way longer to type that than it did to figure it in my head.
given : 12mi/18min min --> hrs conversion factor : 1hr = 60 min 12mi/18min x 60min/1hr --> cross-cancelation 18min/60 min = 3/10 12mi/3 x 10/1hr 4mi/1 x 10/1hr 40mi/hr = 40mph✅
Seems like a long explanatiom to a simple problem. speed = distance divided by time. Time is in hours in this case so convert 18 minutes to a fraction of an hour or 18/60 of an hour
I dont understand why not simply using the rule of three to have this solved. Can be done by 60/18×12 which results into 40 and that only takes 2secs. 🙄 If 12 miles in 18mins. how many miles in 60mins? We got three numbers here so we can use the rule of three. Thats it.
I thought about it for a while, and figuring that 60 mph is 1 mile per minute, with some mental juggling I came up with 40 mph. Instead of checking it with my trusty HP-51C, I whipped out my Computer, Dead Reckoning, AN5835-1, which is a WW2 vintage predecessor of the ubiquitous E6B flight computer. I rotated the dial, put 18 minutes under 12 miles. The index marker pointed at 40. Awright!
12 miles in 18 minutes = 4 miles in 6 minutes = 40 miles in 60 minutes = 40 mph
The aviation way to calculate groundspeed
I immediately noticed that 12 is 2/3 of 18. So what I then asked is, "what is 2/3 of 60 minutes". That'll be 40. So that's my knee jerk answer.
That's where I'm at too
Exactly how I did it!
Did you really take 11:19 to compute (12 mi) x (60 min/hr) / (18 min) = 40 mi/hr?
Why not 12/18 = x/60. Cross multiply and you get 720 = 18x. Then you divide both sides by 18 and you get x = 40. That means you travel 40 miles in 60 minutes or 1 hour!
(12/18) (miles/min) (60 min/hr) = (2/3)(60)(miles/hr) = 40 mph
why so complicated ? find out how fast in a minute and multiply by 60 . 12 divided 18 times 60 , speed = distance over time
Hmm. I just multiplied 12 miles and 18 minutes by 10. So it travels 120 miles in 180 minutes. I then divided by 3 to get the answer of 40 mph.
This is also how I solved it without any math/calculator, etc.
same here.... wrote that in above before I looked down to see someone had already done it that way.
My brain said 36 miles in 54 minutes, leaving 6 minutes. 6 minutes is 1/3 of 18. So 1/3 of 12 is 4. 36 +4=40. I won't quit my day job... Lol😅
Same method (I was schooled UK long time ago pre-decimal so very used to dealing with fractions)
12 miles ÷ 18 minutes × 60 minutes/hour = 40 miles/hour
One division (only) and one multiplication (only).
Speed = distance / time
In this case 12 miles per 18 minutes = 4 miles per 6 minutes = 40 miles per 60 minutes
so the speed is 40 mph.
I remembered that rate x time = distance but couldn't remember how to convert minutes into hours. Thanks for the refresher for the old lady!
Changing units, here we go.
So, we have a train that goes 12 miles in 18 minutes. In order to get their speed in MPH, we need to remember there are 60 minutes in an hour, so our conversion factor will be:
60 min / 1 hr
Now all we need to do is multiply:
12 miles / 18 min * 60 min / 1 hr
= 2 miles / 1 min * 20 min / 1 hr
= 2 miles / 1 * 20 / 1 hr
= 40 miles / 1 hr
= 40 MPH
Now, you may notice that certain numbers may be easy to calculate portions of another number, but that may not always be the case. Using conversion factors like we have above is a sure fire way to always solve these.
Chicken ladder works:
12 miles 60 minutes = 720 = 40 miles
18 minutes 1 hour = 18 = 1 hour
(Minutes cancelled out, leaving Miles per Hour.)
40 60 / 18 = 3.3333 X 12 = 40 thanks for the fun.
Using the conversion factor: (60 min/hr)...
(12 mi/18 min) * (60 min/hr) = (40 mi/hr) = 40 mph
12 miles in 18 minutes means 4 miles in 6 min, so 40mph
18 mins=12 miles
1 min=12/18
60mins=12/18×60
= 40 miles per hour
easiest way I figured this out was to take the 18 minutes and figure when it was an even number of hours..... could simply see 10 X 18 = 180 minutes which was 3 hours. Multiple the twelve by the same ..... 10 X 12 = 120 miles.... 120 miles in 3 hours was 120/3 = 40 mph.
Took me way longer to type that than it did to figure it in my head.
given : 12mi/18min
min --> hrs
conversion factor : 1hr = 60 min
12mi/18min x 60min/1hr --> cross-cancelation 18min/60 min = 3/10
12mi/3 x 10/1hr
4mi/1 x 10/1hr
40mi/hr = 40mph✅
12 = X
--- ---
18 60
X = 12 X 60
----- = 40 mph
18
12/18 = x/60, x = (60 · 12)/18 = 40.
Simple, just use the factor-label method.
Seems like a long explanatiom to a simple problem. speed = distance divided by time. Time is in hours in this case so convert 18 minutes to a fraction of an hour or 18/60 of an hour
12 / 18 =X/60
18X = 720
X= 40
40
Thanks, my initial answer in my head waS 40
40 in my head
Hi
Well. Well. 12 miles in 18 mins would mean, 120 miles in 3 hrs, i.e 40 miles per hour.
Or divide 18 into 60 and come up with 3.3 times 12 = 40
15 secondes pour résoudre mentalement un problème de CM2 (11 ans en 1958)
(12 x 60)/ 18 = (4x180)/18= 4x10 = 40 mph
40 mph.
60/18 x 12 = 40mph
Answer: (60/18)×12= 40
40 miles per hour
40 miles/hr
40miles per hour.
40mph
40 mls/hr.
40 mph
40mi/hr
If the train goes 12 miles in 18 minutes. How many miles will it go in 60 minutes? 40. RxT=D Speed x Time =Distance. 60÷18=3.3 x12=40 mph.
This is a repeat from Feb 5, 2024.
I divided 60 by 18 and multiply the answer by 12..
I dont understand why not simply using the rule of three to have this solved. Can be done by 60/18×12 which results into 40 and that only takes 2secs. 🙄
If 12 miles in 18mins. how many miles in 60mins? We got three numbers here so we can use the rule of three. Thats it.
Entertaining, but overly complex? Thanks, I'll be back next time 😊
90 mph
Oh he talks so much lose my attention
40 mph
40 mph