if it is 12 noon at 15 degree west longitude , what time is at prime meridian (a) 1 pm (b) 11 pm (c) 12 noon
Answers
time at prime meridian = 1 PM if it is 12 noon at 15 degree west longitude
Explanation:
360 deg longitude = 24 hours
=> 1 deg longitude = 24 / 360 hr = 1/15 hr = 4 mins
Prime meridian follows GMT is at 0 deg longitude
East is ahead of GMT & West lags GMT
it is 12 noon at 15 degree west
which is lagging by 15 * 4 = 60 mins = 1 hr
Hence time at prime meridian = 1 PM
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(a) 1 pm
Explanation:
The earth takes 24 hours to make one rotation, which is 360° of longitudes.
So per hour, the angles covered by rotation = 360/24 = 15°.
Time take to travel 1° = 1 hour / 15° = 60 minutes / 15 = 4 minutes.
Prime meridian is the 0° longitude.
Given 15° west longitude is 12 noon.
So Prime meridian is towards the east of this time. So we have to add time equivalent for 15° = + 1 hour.
So time at 0° longitude or Prime Meridian = 12 noon + 1 hour = 1 PM.
Option A is the answer.