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 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 journ…

Accepted Answer

Option D. 67.2 km/hr. Answer & Solution Answer: Option D Solution: & Average speed & = 2xy x + y 1pt 1pt km/hr & = 2 × 84 × 56 84 + 56 1pt 1pt km/hr & = 2 × 84 × 56 140 1pt 1pt km/hr & = 67.2 1pt 1pt km/hr

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.

Solution