Final answer:
The calculation of the distance between two locations using time difference is based on the principles of longitude and time zones.
Explanation:
Longitude calculation: To calculate the distance between two locations based on time, we can use the formula 15° of longitude for every 1 hour of time difference. In the given example, London is 2.5 hours ahead of Allahabad. Therefore, the distance between them is 2.5 hours x 15° = 37.5° west of London.
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