Question
A man covers the journey from a station A to station B at a uniform speed of 36 km/hr and returns to A with a uniform speed of 45 km/hr. His average speed for the whole journey is :
Answer: Option C
Answer: (c)Using Rule 5,Here same distances are covered at different speeds.Average speed= $({2xy}/{x + y})$ kmph= $[{2 × 36 × 45}/({36 + 45})]$ kmph= ${2 × 36 × 45}/81$ = 40 kmph
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Answer: (c)Using Rule 5,Here same distances are covered at different speeds.Average speed= $({2xy}/{x + y})$ kmph= $[{2 × 36 × 45}/({36 + 45})]$ kmph= ${2 × 36 × 45}/81$ = 40 kmph
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