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 and (ii) an hour more to cover the distance?

Answer 1

d = r*t = 12 km
3 * t = 12
t = 4 h

1. d = r*t = 12
r * 3 = 12
r = 4 km/h

Change = 4 - 3 = 1 km/h = 1 km/h increase.

2. d = r*t = 12 km
r * 5 = 12
r = 2.4 km/h.

Change = 2.4 - 3 = -0.6 km/h = 0.6 km/h
decrease.

Answer 2

bakvas

Answer 3

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