Four bells toll at an interval of 8, 12 , 15 and 18 seconds respectively. All the four begin to toll together. How many times will they toll together in one hour excluding the one at the start ?
all of the above
Incorrect AnswerExplanation:
The nest time they toll together is given by the LCM of 8,12,15 and 18
8= 2*2*212=2*2*315 = 3*518=2*3*3
LCM = 2*2*2*3*3*5 = 360
so they will toll together every 360 seconds
So in hour hour they will toll 3600/360 = 10 times
Hence, option 2 is the correct answer.
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By: Amit Kumar