Question

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 1

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It is given that the speed of A is 4 rotations / 120 sec = 1 rotation / 30 sec

Similarly , the speed of B is 3 rotations / 60 sec  =  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.

Answer 2

Answer:

60 seconds

Step-by-step explanation:

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