Question

A man travels 400 km, partly by bike and partly by train. If the speed of bike is 50 km/h and the speed of train is 100 km/h, and he covers 40% of the distance by bike, what is the average speed of the whole journey? (Round off to nearest integer)

A 25 km/h
B 71 km/h
C 45 km/h
D 95 km/h
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