Question

Mark An important program about the International Seafarer's Day was to be broadcast from Mumbai located at 73° Eat 3:30 p.m. on 25th June. This was heard by some Indian sailors in Manila, Philippines at 121° E longitude. What would be date and time there?​

Answer 1

Ivory Coast is located at 200W and Mumbai at 730E longitude. The difference in both the longitudes is 730+200=930 (Ivory Coast lies in the west of Prime Meridian and Mumbai to the east of the Prime Meridian, we will add the longitudes of both the places).  

The difference in time between the two places is 930 X4= 372 (we multiply it by 4 because one degree of each longitude takes 4 minutes to travel to the other longitude).

372= 6 hrs and 12 minutes. Since  Ivory Coast is to the west of Mumbai, its time is behind Mumbai. So we subtract the difference from the time in Mumbai.

7:30-6:12=1hr 18 min. Now we will subtract 1 hr and 18 minutes from 12:00am midnight.  

12:00am-1hr and 18 minutes=10:42pm.

So, the  local time in Ivory Coast will be 10:42pmn: