# Sheela cycles to her school at an average of 12 km / h . It takes her 20 minutes to reach the school. If she wants to reach her school in 15 minutes, what should be her average speed?

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by charlotteds9

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by charlotteds9

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Average speed of sheela = 12km/h

time taken = 20minutes = 20/60 hour = 1/3 hour

distance = speed×time = 12×(1/3) = 4km

if she has to reach there in 15 minutes

time = 15 minutes = 15/60 hour = 1/4 hour

distance = 4km

speed = distance/time = 4/(1/4) = 4×4 = 16km/h

her average speed should be 16km/h.

time taken = 20minutes = 20/60 hour = 1/3 hour

distance = speed×time = 12×(1/3) = 4km

if she has to reach there in 15 minutes

time = 15 minutes = 15/60 hour = 1/4 hour

distance = 4km

speed = distance/time = 4/(1/4) = 4×4 = 16km/h

her average speed should be 16km/h.

time=20 m=20/60=1/3

distance=speed*time=12*1/3=4 km

time= 15 m=15/60=1/4

speed=distance/time=4/1/4=16/1=16 km/hr