Four bells toll at interval of 10 seconds, 15 seconds, 20 seconds and 30 seconds respectively. If they toll together at 10:00 am at what time will they toll together for the first time after 10 am ?

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Solution

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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Four bells toll at interval of 10 seconds, 15 seconds, 20 seconds and 30 seconds respectively. If they toll together at 10:00 am at what time will they toll together for the first time after 10 am ?

The time interval between simultaneous tolling of the bells = LCM(10, 15, 20, 30) seconds = 60 seconds = 1 minuteHence, the bells will toll together again for the first time after 10:00 am at 10:01 am.

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.