A girl walks 12 km at a speed of 30 km/h. What changes should she make in her spead to take (i)in hour less (ii)an hour more to cover the distance?
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i) time should be less than 1 Hours
t=3
d=12km
s=d\t=12\4= 4km\h
ii) an hour more cover to distance then
t=5h
s=d\t=12\5=2.4km\h
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