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ICSE Class 9 Answered

An important programme was to be broadcasted from mumbai at 7.30 pm which is heard by soldiers at ivory coast at 20° west. What is the time at ivory coast
Asked by basu95.sangeeta | 24 May, 2018, 09:54: AM
answered-by-expert Expert Answer
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 10:42pm
Answered by Social Science Expert | 24 May, 2018, 11:04: PM
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