Four bells toll at intervals of 10s, 15s, 20s and 30s respectively. If they toll together at 10:00 a.m., at what time will they toll together for the first time after 10 a.m. ?
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The time interval between simultaneous tolling of the bells = LCM(10, 15, 20, 30)
Seconds = 60 seconds = 1 minute
Hence, the bells will toll together again for the first time after 10:00 am at 10:01 AM...
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