In a 5.23 km race, one runner runs at a steady 11.2 km/h and another runs at 14.

Question

In a 5.23 km race, one runner runs at a steady 11.2 km/h and another runs at 14.13 km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?

Explanation / Answer

length of the track=5.23 km speed of slower runner =11.2 km/h ==> time taken by him to complete the race=(distance traveled )/(speed of runner) ==>5.23/11.2 =0.467 h =28.01 min similarly length of the track=5.23 km speed of faster runner =14.13 km/h ==> time taken by him to complete the race=(distance traveled )/(speed of runner) ==>5.23/14.13 =0.370 h =22.20 min time taken to wait=0.467 h- 0.370 h=0.097 h=5.82 min

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