A boy runs for 20 min. at a uniform speed of 18km/h. At what speed should he run for the next 40 min. so that the average speed comes 24km/hr.
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in 20 min boy run at speed 18km/he
1 min. 18÷20
so for in 40 min
speed = 40×18÷20
uniform speed = 36 km /hr
1 min. 18÷20
so for in 40 min
speed = 40×18÷20
uniform speed = 36 km /hr
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