Question
On a journey across Kolkata, a taxi averages 50 km per hour for 50% of the distance, 40 km per hour for 40% of it and 20 km per hour for the remaining. The average speed (in km/hour) for the whole journey is :
Answer: Option D
Answer: (d)Using Rule 2,Total distance = 100 km.Total time = $50/50 + 40/40 + 10/20$= $1 + 1 + 1/2 = 5/2$ hoursAverage speed = ${100 × 2}/5$ = 40 kmph
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Answer: (d)Using Rule 2,Total distance = 100 km.Total time = $50/50 + 40/40 + 10/20$= $1 + 1 + 1/2 = 5/2$ hoursAverage speed = ${100 × 2}/5$ = 40 kmph
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