13. A girl walks 12 km at the speed of 8 km/h. What change should she make in ber speed to
iake (1) an hour less and an hour more to come the distance?
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Answer:Formula of speed is
\frac{distance}{time} = speed
\frac{12}{x} = 3
x=4
if she take 1hour less then
\frac{distance}{time} = speed
\frac{12}{3} = speed
speed=4km/hour
so speed will increase by 1km/hr
Step-by-step explanation:
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