Question

What will be local time at Delhi 77° E longitude when it is 3 p.m. at Tokyo 139°E longitude?

Answer 1

Longitude of Delhi = 77°E

Longitude of Tokyo = 139°E

The difference per degree = 139° – 77° = 62°

Difference of time per degree = 4 minutes 

Difference between the time of Delhi and Tokyo = 4 × 62 = 248 minutes = 4 hours 8 minutes

Since Delhi lies west of Tokyo we shall subtract 4 hours 8 minutes from Tokyo time. Hence local time at Delhi is 10.52 a.m.