A motorist travels to a place 150 km away at an…

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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-

  1. A. 35 km/hr
  2. B. 37 km/hr
  3. C. 37.5 km/hr
  4. D. 40 km/hr

Answer: Option C

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Solution(By ExamCraze Team)

Average speed
$$eqalign{ & = left( {frac{{2xy}}{{x + y}}} right){text{ km/hr}} cr & = left( {frac{{2 times 50 times 30}}{{50 + 30}}} right){text{ km/hr}} cr & = 37.5{text{ km/hr}} cr} $$

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