Question 696696: Two balls A and B rotate along a circular track. Ball A makes 4 full rotations in 120 seconds. Ball B makes 3 full rotation in 60 seconds. If they start rotating now from the same point, when will they be at the same starting point again?
Answer by god2012(113)   (Show Source):
You can put this solution on YOUR website! Solution :
It is given that the speed of A is 4 rotations / 120 second
This is equal to 1 rotation / 30 sec
Similarly , the speed of B is 3 rotations / 60 sec
or 1 rotation / 20 second
Now, let us take the HCF of the time taken by both the balls A and B.
i.e. HCF of 30 and 20 is 60.
Therefore , the balls meet at the starting point at every 60 mins interval.
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