Question

Four bells toll at an interval of 10s,15s,20s and 30s respectively. If they all toll together at 10am, at time will they toll together for first time aftet 10am
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Answer 1

Answer:

LCM of 10, 15, 20 and 30 will be the answer

LCM is 60 sec

so they toll together after 1 minute, i.e., at 10.01 a.m.