Correct Answer - Option 4 : 75 degree W. Longitude

The correct answer is **75 degrees W. Longitude.**

**Finding Direction:**

\(\implies \)Current time in India = 12:00 p.m.

\(\implies \)Time at required meridian = 7:00 a.m.

\(\implies \)Difference in time = 5 hrs, and this time at meridian(7:00 a.m.) is** 5 hrs 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 24 hrs. for one complete rotation, so

\(\implies \)24 hrs. = 360°

\(\implies \)1 hr = \(\frac {360} {24}\)= 15°, thus the** Earth rotates 15 degrees in 1 hr.**

\(\implies \)**In 5 hrs = 5 × 15° = 75°.**

Hence at 75° West longitude, the time will be 7:00 a.m.