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If the local time at Dwarka (69°01′E) in Gujarat to the west of India is 6 am, what will be the local time at Dibrugarh (94°58′E approximately 95°), in Assam, in the east?

  • a)
    4.16 am

  • b)
    6.30 am

  • c)
    7.44 am

  • d)
    7.44 pm

Correct answer is option 'C'. Can you explain this answer?
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If the local time at Dwarka (69°01′E) in Gujarat to the west of India ...
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If the local time at Dwarka (69°01′E) in Gujarat to the west of India ...
To find the time difference between Dwarka and Dibrugarh, we need to calculate the longitudinal difference between the two cities.

Longitudinal difference = 94°58′E - 69°01′E
= 25°57′E
= 25.95°E (approx.)

We know that 1 hour of time difference corresponds to 15° of longitudinal difference.

So, time difference = 25.95°E/15° per hour
= 1.73 hours
= 1 hour 44 minutes (approx.)

Now, we need to add this time difference to the local time at Dwarka to get the local time at Dibrugarh.

Local time at Dibrugarh = Local time at Dwarka + Time difference
= 6 am + 1 hour 44 minutes
= 7:44 am

Therefore, the correct answer is option C - 7:44 am.
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Community Answer
If the local time at Dwarka (69°01′E) in Gujarat to the west of India ...
Here's the detailed Explanation:

- Dibrugarh in Assam and Dwarka in Gujarat had a difference of 1hour and 45 min.  
There is a time lag of two hours between Arunachal Pradesh and Gujarat.

- To avoid the time differences  82 degrees 30' Eastern Longitude is taken as Standard meridian of India which is passing through the middle of the country. We have uniform time because of  Indian Standard Time.
 
Hence, the correct answer is 7:44am.
 
I was able to solve this question by reading these notes which I found very useful:


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