Four bells begin to toll together and then each one at intervals of 6 s, 7 s, 8 s and 9 s respectively. The number of times they will toll together in the next 2 hr is:
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Step-by-step explanation:
The L. C. M of 6,7,8 and 9 is 504.
Therefore after 504 secs they will once again rang together.
So, 504 secs = 8 mins and 24 secs.
So in 2hrs the bell will ring 14 times.
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