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Five bells begin to toll together and toll respectively at intervals of 6, 5, 7, 10 and 12 seconds. How many times will they toll together in one hour excluding the one at the start ?
  • a)
    7 times
  • b)
    8 times
  • c)
    9 times
  • d)
    11 times
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Five bells begin to toll together and toll respectively at intervals o...
L.C.M. of 6, 5, 7, 10 and 12 is 420.
So, the bells will toll together after every 420 seconds i.e. 7 minutes.
Now, 7 x 8 = 56 and 7 x 9 = 63.
Thus, in 1-hour (or 60 minutes), the bells will toll together 8 times, excluding the one at the start.
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Five bells begin to toll together and toll respectively at intervals of 6, 5, 7, 10 and 12 seconds. How many times will they toll together in one hour excluding the one at the start ?a)7 timesb)8 timesc)9 timesd)11 timesCorrect answer is option 'B'. Can you explain this answer?
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