Question
A constant distance from Chennai to Bangalore is covered by Express train at 100 km/hr. If it returns to the same distance at 80 km/hr, then the average speed during the whole journey is
Answer: Option B
Answer: (b)Using Rule 5,If same distance are covered at two different speed of x and y kmph,the average speed of journey = ${2xy}/{x + y}$= $({2 × 100 × 80}/{100 + 80})$ kmph= 88.89 kmph
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Answer: (b)Using Rule 5,If same distance are covered at two different speed of x and y kmph,the average speed of journey = ${2xy}/{x + y}$= $({2 × 100 × 80}/{100 + 80})$ kmph= 88.89 kmph
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