Three bells start ringing together, and then ring at intervals of 3, 5 and 10 minutes respectively. The three bells will ring together every
___ minutes.
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three bells 7,10,14 minutes
they will be ringing after l.c.m of (7,10,14) minutes
factorise 7,10,14
7=7
10=5×2
14=7×2
⇒ l.c.m (7,10,14)=7×2×5=70
∴ they will be ringing together after 70 minutes.
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