Distance between two stations A and B is 778km. A train covers the jo…

Question

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 jou…

Accepted Answer

Option D. 67.2 km/hr. Answer & Solution Answer: Option D Solution: The required average speed given by the formula, & Average speed & = 2xy x + y \,\, km/hr & Where, & x = 84 1pt \, kmph & y = 56\, 1pt kmph & Average speed & = 2 × 84 × 56 84 + 56 & = 67.2\, 1pt kmph

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.

Solution