Question
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
Answer: Option C
Answer: (c)Using Rule 5,Average speed of whole journey= $({2xy}/{x + y})$ kmph= ${2 × 50 × 30}/{50 + 30}$= ${2 × 50 × 30}/80$ = 37.5 kmph
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Answer: (c)Using Rule 5,Average speed of whole journey= $({2xy}/{x + y})$ kmph= ${2 × 50 × 30}/{50 + 30}$= ${2 × 50 × 30}/80$ = 37.5 kmph
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