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Question

In a 500 m race ,the ratio of the speed of two contestants A and B is 3 : 4. A has a start of 140 m .Then A beats B by

A
60 m
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B
40 m
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C
20 m
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D
10 m
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Solution

The correct option is B 20 m

To reach the winning post A will have to cover a distance of (500140)m=360m.

As the ratio of speeds is 3:4

A covers 3m, B covers 4m.

While A covers 360m, B covers 43×360=480m.

Thus, when A reaches the winning post, B covers 480m and therefore remains (500480)m behind.

A wins by 20m.


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