Question

Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per
hour and returns back to A with a uniform speed of 56km per hour. Find the average speed of the train
during the whole journey?
(a) 69.0 km/h
(c) 67.0 km/h
(b) 69.2 km/h
(d) 67.2 km/h​

Answer 1

please refer to the attachment for the solution