Question

A person is travelling 500 km, partly by car and partly by train. The speed of the car is 70 km/h and train is 100 km/h. If the person drives for 55% of the distance, find the average speed of the complete journey (round off to the nearest whole number).

A 20 km/h
B 81 km/h
C 40 km/h
D 56 km/h
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