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A runs 123 times as fast as B. If A gives B a start of 80 m, how far must the winning post be so that A and B might reach it at the same time?

Correct Answer: 200 m

Explanation:

Ratio of the speeds of A and B =5 : 1 = 5 :3


 


Thus, in race of 5 m, A gains 2 m over B.


 


2 m are gained by A in a race of 5 m.


 


80 m will be gained by A in race of 5 2 * 80  m =200m


 


=> Winning post is 200 m away from the starting point.


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