1.

Mashad, a town in Iran, is located on the 60° E longitude. When it is 12 noon at Greenwich, calculate the local time of Mashad town.

Answer»

1. Statement: As we move towards the east of the Prime Meridian, the local time increases by four minutes for every longitude. (Mashad is located to the east of Greenwich.) 

2. The difference between the longitudes of Greenwich and Mashad = 60°. 

3. Difference in local time 

= 60 × 4 

= 240 minutes. 

= 240 minutes ÷ 60 minutes 

= 4 hours.

4. Therefore, when it is noon at Greenwich, it would be 4 p.m. at Mashad. (Ahead of Greenwich Mean Time by 4 hours.)


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