Question

Calculate the local time at Singapore(104 degress East) when it is 6:00 p.m at Greenwich.

ICSE Class 9 Total Geography Ch 2:Geographic Grid- Latitudes and Longitudes

Answer 1

for each 15°longitude the time change by 1 hour
added for east and subtacted for west
since Singapore is 104°east it will be 104/15 hrs ahead of Greenwich 0:56 am of next day

Answer 2

Answer:

These are the details available-

Location of Singapore= 104 degrees East

Greenwich time (GT)= 6:00 PM

Local Singapore time=?

Since Singapore is towards the East of the prime meridian, the time will be ahead of the GT time. Let us first calculate how many hours is it ahead.

We know that 1 degree is equal to 4 minutes in time. (dividing 360 degrees of longitude by 24 hours will give us 15. That is in an hour the earth can revolve 15 degrees. Calculating the time it takes to move a degree will be 60/15= 4 minutes).

To know how much time Singapore is ahead of GT= 104 * 4= 416 minutes or 6 hours 56 minutes.

It is given that the time is 6:00 pm in Greenwich, as Singapore is 6 hours and 56 minutes ahead of GT, local time in Singapore will be 12:56 AM.