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R_scott is right
Answers (1)
D time = distance / rate = 20 km / 10 kph = 2 hr M has covered ... 20 km - 4 km = 16 km ... in 2 hr ... 16 km / 2 hr = 8 kph M has 4 km to go ... 4 km / 8 kph = 1/2 hr thanks R_Scott.
