An athlete has to cover a distance of 10 km in 30 minutes. If he covers half of the distance in 1/3rd of total time, what is the speed required to cover the remaining distance in remaining time?
Remaining distance=5 km
Remaining time=(2/3)*30=20 min=1/3 hour
Required speed=5/(1/3)=5*3=15 km/hour
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