Question
A train goes from Ballygunge to Sealdah at an average speed of 20 km/hour and comes back at an average speed of 30 km/hour. The average speed of the train for the whole journey is
Answer: Option B
Answer: (b)UsingRule 5,Required average speed= ${2 × 30 × 20}/{30 + 20}$[Since, Distance covered is same]= ${2 × 30 × 20}/50 = 24$ kmph
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Answer: (b)UsingRule 5,Required average speed= ${2 × 30 × 20}/{30 + 20}$[Since, Distance covered is same]= ${2 × 30 × 20}/50 = 24$ kmph
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