if a race of 100m.a run at a speed of 10m/sec .and b runs at a speed of 8m/sec by what time will a beat b ??
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As A is running at the speed of 10 m/sec, he will take 10 seconds to complete the 100 metre race. And B takes 10 + 1.25 = 11.25 seconds to cover 90 metres. Therefore, the speed at which B is running = = 8 m/sec. Running at 8 m/sec, B will take = 12.5 seconds to complete the 100 metre race.
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