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Three bells, ...

Question

Three bells, toll at intervals of $36$ sec, $40$ sec and $48$ sec respectively. They start ringing together at particular time. They next toll together after

A

6

minutes

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B

12

minutes

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C

18

minutes

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D

24

minutes

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Solution

The correct option is A $12$ minutes
G.C.D of $36, 40, 48 = 720 \Rightarrow 720 s e c = 12 m i n$
$∴$ Next time when three balls toll together is after $12$ mins

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