A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30 km/hr.His average speed for the whole jouney in km/hr is
A. 36.5 km/hr
B. 37.5 km/hr
C. 35.5 km/hr
D. 34.5 km/hr
Answer: Option B
Explanation:
Average speed will be
2xyx+ykm/hr2xyx+ykm/hr
= \frac{2(50)(30)}{50+30} km/hr
= 37.5 km/hr
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