CBSE Class 6 Answered

The time at Prime meridian is 5:30Am

a)     15 degree East: 15X4=60 minutes=1 hour

(The earth rotates 1⁰ in four minute, so we will divide the longitude by 15. As the earth rotates from west to east, those places that lie east of Greenwich are ahead than the places that lie to the west of Greenwich. Hence, we will add one hour to the given time at the Prime meridian.

Thus, the time at 15 degree East will be 6:30 Am.

b)     50 degree West: 50X4=200 minutes= 3 hrs and 20 minutes

Since the place is located to the west of the prime meridian, its time will be behind that of the Prime meridian.

Thus, the time at 50 degree West will be 2:10 AM.