Country ‘A’ lies 25 degrees east of country ‘B’. If the local time of ‘A’ is 11:00, what is the local time of ‘B’?

Correct answer: d 9:20

25 × 4 = 100 minutes = 1 h 40 min; B is west, so 11:00 − 1 h 40 min = 9:20.

Why the other options are wrong

• a 12:40: 12:40 would be right if B were in the east; B is in the west, so subtract.
• b 8:20: 8:20 would be 40° west (160 minutes); the gap is 25°, that is 100 minutes.
• c 10:40: 10:40 would be 5° west (20 minutes); the gap is 25°, that is 100 minutes.