Question

A person travels from town A to town B, a distance of 20 km, at 4 km/h, and then from B to C, a distance of 30 km, at 5 km/h. What is his average speed for the entire journey?

A 65 km/h
B 50/11 km/h
C 12/11 km/h
D 18 km/h
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