Two trains started at 7AM from the same point. The first travelled north at 80 km/h and the second travelled south at 100 km/h. The time at which they were 540 km apart is ______ AM.
Options:
(A) 9
(B) 10
(C) 11
(D) 11.30
Official Answer Key:
B
Step-by-Step Solution & Explanation
The trains move in opposite directions, so the separation rate = 80 + 100 = 180 km/h. Time to reach 540 km apart = 540/180 = 3 hours after 7 AM = 10:00 AM. Answer: (B) 10.
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