21. 4 Bells toll together at 9.00 am. They toll after 7, 8, 11 and 12 seconds respectively. How many times will they toll together again in the next 3 hOUR?
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Step-by-step explanation:
so we add 30 m 48 sec to the previous time instant that they tolled together. next it will be at 12 h 04 min 48 sec.. this is after 3 hrs from 9 am. = 5.84 times that is 5 times
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