Five bells beginning together toll at intervals 4, 5, 7, 8 and 10 seconds respectively. After what interval of time will they toll together again?

4 min 10 s

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4 min 35 s

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4 min 40 s

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4 min 20 s

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Solution

The correct option is A 4 min 40 s
The time after which they will ring together will be LCM of $4, 5, 7, 8, 10$ which is $280 s e c$ that is equal to $4 m i n 40 s e c$
So correct answer will be option C

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Five bells beginning together toll at intervals 4, 5, 7, 8 and 10 seconds respectively. After what interval of time will they toll together again?

The correct option is A 4 min 40 sThe time after which they will ring together will be LCM of 4,5,7,8,10 which is 280sec that is equal to 4min40secSo correct answer will be option C

The correct option is A 4 min 40 s
The time after which they will ring together will be LCM of $4, 5, 7, 8, 10$ which is $280 s e c$ that is equal to $4 m i n 40 s e c$
So correct answer will be option C