Three bells commenced to toll at the same time and tolled at intervals of $20, 30, 40$ seconds respectively. If they toll together at $6$ am, then which of the following is the time at which they can toll together

6 : 55

6 : 56

6 : 57

6 : 59

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Three bells commenced to toll at the same time and tolled at intervals of

20, 30, 40

seconds respectively. If they toll together at

6

am, then which of the following is the time at which they can toll together

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Question Text

Three bells commenced to toll at the same time and tolled at intervals of

20, 30, 40

seconds respectively. If they toll together at

6

am, then which of the following is the time at which they can toll together

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