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In a 400 m race, A gives B a start of...

In a 400 m race, `A` gives `B` a start of 5 seconds and beats him by 15 m. In another race of 400 m, `A` beats `B` by `7 1/7` seconds. Their respective speeds are (a) 6 m/sec, 7 m/sec (b) 5 m/sec, 7 m/sec (c) 8 m/sec, 7 m/sec (d) 9 m/sec, 7 m/sec

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