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 84km per hour and returns back to A with a uniform speed of 56km 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)

$$eqalign{ & {text{Average speed}} cr & = {frac{{2xy}}{{ {x + y} }}} {kern 1pt} {kern 1pt} {text{km/hr}} cr & = {frac{{ {2 times 84 times 56} }}{{ {84 + 56} }}} {kern 1pt} {kern 1pt} {text{km/hr}} cr & = {frac{{ {2 times 84 times 56} }}{{140}}} {kern 1pt} {kern 1pt} {text{km/hr}} cr & = 67.2{kern 1pt} {kern 1pt} {text{km/hr}} cr} $$

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