Question
The speed of a train going from Nagpur to Allahabad is 100 kmph while its speed is 150 kmph when coming back from Allahabad to Nagpur. Then the average speed during the whole journey is :
Answer: Option C
Answer: (c)Using Rule 5,Here, the distances are equal.Average speed= $({2 × 100 × 150}/{100 + 150})$ kmph= ${2 × 100 × 150}/250$ = 120 kmph
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Answer: (c)Using Rule 5,Here, the distances are equal.Average speed= $({2 × 100 × 150}/{100 + 150})$ kmph= ${2 × 100 × 150}/250$ = 120 kmph
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