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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Answered by
7
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.
Answered by
3
speed=12km/hr
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
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
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