Five bells begin to ring together and ring respectively at intervals of 5, 6, 15, 18 and 24
seconds respectively. How many times will they ring together in one hour except the one
at the beginning?
(a) 9 times (1) 10 times (0) 11 times (d) None of these
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LCM of 5,6,15,18,24=360
in one hour we have 3600 second= 3600/360=10times
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