21. Four bells toll at intervals of 10 s, 15 s, 20 s and 30 s respectively. If they toll together at 10:00 am at what time will they toll together for the first time after 10 am? (a) 10:01 am (b) 10:02 am (c) 10:00:30 am (d) 10:00:45 am
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Answer:
The answer is a) 10:01 am
Step-by-step explanation:
The time interval between tolling of bells = LCM of 10, 15, 20, 30 seconds is 60 seconds (that is equal to 1 min)
Hence, The bells will toll again for the first time after 10:00 at 10:01
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