A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. His average speed for the whole journey in km per hour is-

A 35
B 37
C 37.5
D 40

Correct Answer: 37.5

Total time spent in the whole journy = 150/50 + 150/30 = 3 + 5 = 8 hours The average speed of the whole journy = total distance/total time = (150 + 150)/8 = 37.5 km/hr
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