a girl walks 12km at the 3km/h . what change should she
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12-9=
9km/h change she would have
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Q. A girl walks 12 km at the speed of 3 km/h.what change should she make in her speed to take (i)an hour less (ii) an hour more to cover distance
Sol:- Speed = 3 km/h, distance = 12 km then
s = d/t = 12/3 = 4 h
i) time should be less than 1 hr then
t = 3 h, d = 12 km
s = d/t = 12/ 3 = 4 km/h
ii) an hour more to cover distance then t = 5 h
s = d/t = 12/5 = 2.4 km/h
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