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Question
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 $$7\frac{1}{7}$$ seconds. Their respective speed are -
Options:
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
Answer: Option C

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