A, B, C are running around a circular park. They start at the same point. A overtakes C, 3 times for every round that C makes. C overtakes B, 6 times for every round that B makes. What is the ratio of A's speed to that of B?
A: 9:2
B: 18:1
C: 28:1
D: 21:1
Answer: C
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    A is it necessary that to cross 3 time the speed should be 4 times ?

    if the speed is just 3times more then also it will cross 3 time is not it ?




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