The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. find the average speed during whole journey.
Answer: 120 km/hr
Explanation
Average speed,=2×x×yx+y=2×100×150100+150=200×150250=120km/hr
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