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 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 | 19th Dec, 2018, 09:49: AM