Question

It is 12 noon at Greenwich. What will be the time at a place situated at 60° East Longitude?
1. 2 am
2. 2 pm
3. 4 am
4. 4 pm
5.

Answer 1

Correct Answer - Option 4 : 4 pm

The correct answer is 4 pm.

Concept:

•  As we know that Greenwich Meridian Time (GMT) is located at 0^o longitude.
  • When we move towards the east of GMT, it takes 4 minutes to cross each degree of longitude.
    • i.e: Time taken to cross 1^o East longitude = + 4 minutes. (1^o West longitude = - 4 minutes)
  • It means when we move towards the east of GMT, time increases.
    • ​While, when we move towards the west of GMT, time decreases.

Solution:

• As given, Time at GMT = 12 noon.
• The place is situated at 60° East longitude.
• From the above concept, we know that 1° East longitude = 4 minutes ahead.
• Therefore, 60° East longitude = 4 × 60 = 240 minutes ahead.
  • Here, 240 minutes = 4 hrs.
• Hence, Required time at given place = 12 noon + 4 hours = 4 pm.