The correct answer is 75 degrees W . Longitude. Key Points Finding Direction: ⟹ Current time in India =12:00p⋅m. ⇒ Time at required meridian =7:00 a.m. ⇒ Difference in time =5hrs, and thistime at meridian (7:00a.m. ) is 5hrs behind. Hence it is west direction. Note: When time on a meridian is lagging with respect to the time of others, then it lies to the west. Calculation of Longitude: As we know the Earth takes 24hrs.for one complete rotation, so ⟹24hrs.=360∘ ⇒1hr=‌
360
24
=15∘, thus the Earth rotates 15 degrees in 1hr. ⇒‌‌‌ In ‌5hrs=5×15∘=75∘ Hence at 75∘ West longitude, the time will be 7:00a.m.