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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.
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