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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 17th December 2018, 7:47 PM
Answered by 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 Expert 19th December 2018, 9:49 AM
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