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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.
  1. 120 km/hr
  2. 135 km/hr
  3. 75 km/hr
  4. 125 km/hr
Explanation


Average speed,=2×x×yx+y=2×100×150100+150=200×150250=120km/hr

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