Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 2

Question

Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?

Options:

A . 31

B . 15

C . 16

D . 30

Answer: Option A

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