Three bells ring at intervals of 36 seconds, 40 seconds and 48 seconds respectively. they start ringing together at a particular time . They wil start ringing together after
A
6 min
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B
12 min
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C
18 min
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D
24min
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Solution
The correct option is B12 min To find the time after which they start ringing together will be LCM of 36,40,48 which is 720 second 12min