ICSE Class 7 Answered
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.
Asked by Sheeshpal.singh15 | 17 Dec, 2018, 07:47: PM
Expert Answer
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
Answered by Sneha shidid | 19 Dec, 2018, 09:49: AM
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