A boy runs for 10 minutes at a uniform speed of 90 km per hour at what speed should be Run for the next 20 minutes so that the average speed comes to 12 km per hour
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The Run for next 20 minutes should be at 13.5 km/hr so that the average speed comes to 12 km/hr.
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Distance travel in 10 minutes is 9*10/60 = 1.5 km. Total time is 10+20= 30 minutes which 1/2 hr . So total distance required to be run is 12/2= 6 km. So remaining distance to be run is 6–1.5=4.5 km . It is to be run in 20 minutes. So required speed is 4.5*60/20=13.5 kmph.
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Distance travel in 10 minutes is 9*10/60 = 1.5 km. Total time is 10+20= 30 minutes which 1/2 hr . So total distance required to be run is 12/2= 6 km. So remaining distance to be run is 6–1.5=4.5 km . It is to be run in 20 minutes. So required speed is 4.5*60/20=13.5 kmph.
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