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Question

# Four bells begin to toll together at intervals of 6,7,8 and 9 seconds. What is the number of times that they will toll together in 2 hours?

A
14
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B
15
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C
13
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D
11
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Solution

## The correct option is C 14L. C. M. of 6,7,8,9=504∴ The bells will start ringing after an interval of every 504 seconds.Now 2 hours =2×60×60 seconds =7200 seconds∴ Number of times the bell will ring in 2 hours =7200504=14.2 timesSince the bells rang together at the start also therefore the bells will ring 14 times in 2 hours.

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