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Distance between two stations A and B is 778km A train…

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Distance between two stations A and B is 778km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of train during the whole journey.

  1. A. 60 km/hr
  2. B. 30.5 km/hr
  3. C. 57 km/hr
  4. D. 67.2 km/hr

Answer: Option D

Here is complete explanation of Distance between two stations A and B is 778km A train….

Solution(By ExamCraze Team)

The required average speed given by the formula,
$$eqalign{ & {text{Average speed}} cr & = {frac{{2xy}}{{ {x + y} }}} ,,{text{km/hr}} cr & {text{Where}}, cr & x = 84{kern 1pt} ,{text{kmph}} cr & y = 56,{kern 1pt} {text{kmph}} cr & {text{Average speed}} cr & = {frac{{ {2 times 84 times 56} }}{{ {84 + 56} }}} cr & = 67.2,{kern 1pt} {text{kmph}} cr} $$

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