Two people running in a circle can complete one revolution in 4 hours and 5 hours respectively. After how many hours will they meet at the starting point?
Explanation:
First person reaches start point after 4, 8, 12, …. (hours)
Second person reaches start point after 5, 10, 15, …. (hours)
Both will meet each other at the starting point after every LCM (4, 5) = 20 hours.
Hence, option (a).
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