Question
A man goes from a place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey is
Answer: Option C
Answer: (c)Using Rule 5,Average speed= $({2xy}/{x + y})$ kmph= $({2 × 12 × 18}/{12 + 18})$ kmph= $({2 × 12 × 18}/30)$ kmph= 14$2/5$ kmph
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Answer: (c)Using Rule 5,Average speed= $({2xy}/{x + y})$ kmph= $({2 × 12 × 18}/{12 + 18})$ kmph= $({2 × 12 × 18}/30)$ kmph= 14$2/5$ kmph
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