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Q.
A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/hr. His average speed for the whole journey in km/hr is :
A.
35
B.
36
C.
37.5
D.
38.2
View Answer
Correct choice: C
Explanation:
Average speed = (2xy) /(x + y) km/hr = (2 * 50 * 30) / (50 + 30) km/hr. 37.5 km/hr.
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