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Four bells toll at intervals 9,15,18 and 21 seconds.If they toll together at 4 p. m;when will they toll next ?

Hey!!!! This came today in my maths application!!!!!!!!


Bells will toll together after every period equal to common multiples of these for mbers.
Afte 4pm,bells will toll for first time after  a period equal to Least Common Multiple of 9, 15, 18, 21 which is 630 seconds, i.e., at 10 min 30 sec past 4pm.
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Bell will rang alltogether after 630sec of 4pm.ie tthe L.C.M of9,15,18,and21
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