How to calculate "Longitude of a Place?" Easy way to calculate it in a short time

Hello everyone,
welcome to my channel "Saipriya's Geography Class"
This is my second video on this channel. Today I am going to show you
How to calculate "Longitude of a Place?" Easy way to calculate it in a short time.
It's from chapter "LATITUDES AND LONGITUDES" (Class 9).
My first video is upon "HOW TO CALCULATE LOCAL TIME OF A PLACE?" (Class 9)
check the previous video which is related with this.
link is given below
• How to calculate "Loca...
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Thank you

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[@gawawangchukdorji3428]

At town a 50 degree east the time is 9pm, at town b the local time is 5 pm. What is the longitude of town b.
Please solve this.

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Substraction and addition reverse boldiya