Question
A train runs from Howrah to Bandel at an average speed of 20 km/ hr and returns at an average speed of 30 km/hr. The average speed (in km/hr) of the train in the whole journey is
Answer: Option A
Answer: (a)Using Rule 5,Average speed = ${2xy}/{x + y}$ kmph= ${2 × 20 × 30}/{20 + 30}$= ${2 × 20 × 30}/50$ = 24 kmph
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Answer: (a)Using Rule 5,Average speed = ${2xy}/{x + y}$ kmph= ${2 × 20 × 30}/{20 + 30}$= ${2 × 20 × 30}/50$ = 24 kmph
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