Six bells begin to toll together at the interval of 10s, 15sec, 20sec, 25sec, 30sec, 35sec respectively, then how many times will they toll together in the span of 7 h ?
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Answer:
Correct option is
D
16
Since, LCM of 2,4,810 and 12 is 120. So, after each 120 seconds, they would toll together,
Hence, in 30 minutes, they would toll
120
30×60
=15 times
But then the question says they commence tolling together. So, they basically also toll at the beginning. So, total tolls together =15+1=16
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