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When it is 12 noon at Greenwich, what time will it be at 25° West of Greenwich? 

When it is 12 noon at Greenwich, what time will it be at 25° West of Greenwich?  Correct Answer 10:20 a.m. 

The correct answer is 10.20 a.m

Key Points 

  •  As we know that Greenwich Meridian Time (GMT) is located at 0o 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 1o East longitude = + 4 minutes. (1o 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.
  • As given, Time at GMT = 12 noon.
  • The place is situated at 25° West longitude.
  • From the above concept, we know that 1° West longitude = 4 minutes back.
  • Therefore, 25° West longitude = 4 × 25 = 100 minutes back.
    • Here, 100 minutes = 1 hr 60 min.

Hence, Required time at given place = 12 noon - 1 hr 60 min = 10:20 am.

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