A) 3 times
B) 2 times
C) 4 times
D) 1 time
Correct Answer: A
Solution :
Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27..... Multiples of 6: 6, 12, 18, 24, 30..... Multiples of 9: 9, 18, 27..... The clocks ring in every 18 minutes together. 1st time the clock will ring in 18 minutes, then at 36 minutes and then at 54 minutes. So in 60 minutes the clocks will ring 3 times.
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