Answers

2015-04-18T17:18:48+05:30
Longitudinal difference between us:30-20=10 degree (since we're in the same hemisphere)
We know,
For a longitudinal difference of 1 degree , time difference = 4 min
Therefore,
For a longitudinal difference of 10 degree,time difference=4*10 min=40 min.
Therefore time difference between extreme places=40 min=2/3 hr. 
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2015-04-20T15:34:51+05:30
Longitudinal difference between us:30-20=10 degree (since we're in the same hemisphere)We know,For a longitudinal difference of 1 degree , time difference = 4 minTherefore,For a longitudinal difference of 10 degree,time difference=4*10 min=40 min.Therefore time difference between extreme places=40 min=2/3 hr. 
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