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 24 km/hr. step by step
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t1=20min
t2=40min
v1=18km/h
av=24km/h
v2=?
distance 20min=18*20/60
=6km
distance 40min=v2*40/60
av=(s1+s2)/(t1+t2)
24=(6+v2*40)/(20+40+60)
24=(6+v2*40)/120
24-6=v2/3
18=v2/3
18*3=v2
v2=54
so the speed in 40 min is 54km/h
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