Question

there are 4 bells which toll at intervals of 3 7 12 and 14 sec respectively. the 4 bells begin to toll at 12 o'clock. when will they next toll together and how often they do so in 14 minutes

Answer 1

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Four bells toll at 12'o clock

LCM of 3,7,12,14 = 84

84 sec = 1min 24 sec

So they will toll together for 1min 24sec.