Question

Q. Three bells toll at intervals of 9, 18 and 27 minutes respectively. If they start tolling together, after
what time will they next toll together?​

Answer 1

Three bells toll at intervals of 9, 18 and 27 minutes respectively.

LCM ( 9, 18, 27 )

LCM = 2×3×3×3 = 54 minutes

Time = 54/60 hours

= 9/10 hours

Hence , time will they next toll together is 9/10 hrs or

0.9 hours

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