Five bells first begin to toll together and then at intervals of 3 s, 5s, 7s, 8s and 10 s. Find after what interval they will gain toll together?

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Five bells first begin to toll together and then at intervals of 3 s, 5s, 7s, 8s and 10 s. Find after what interval they will gain toll together?

A12 minutes

B15 minutes

C8 minutes

D14 minutes

Answer:

D. 14 minutes

Read Explanation:

Required time interval =LCM of (3, 5, 7,8 and 10) = 840 second = 14 minutes

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