A girl walks 12 km at speed of 3km per hour. What change should she make in her speed to take an 1 hour less
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Formula of speed is
x=4
if she take 1hour less then
speed=4km/hour
so speed will increase by 1km/hr
x=4
if she take 1hour less then
speed=4km/hour
so speed will increase by 1km/hr
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