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In a 400 metres race, A gives B a start ...

In a 400 metres race, A gives B a start of 5 seconds and beats him by 15 metres. In another race of 400 metres, A beats B by `7(1)/(7)` seconds. Find their speeds.

A

`8 m/(sec), 6 m/(sec)`

B

`9 m/(sec), 6 m/(sec)`

C

`8 m/(sec), 7 m/(sec)`

D

None of these

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The correct Answer is:
C
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