Question

distance between two stations x andy is 778 km. a train covers distance from x to y at a speed of 84kmph and returns on x at speed of 56kmph.what is the average speed of train?

Answer 1

I dint understant the question

Answer 2

$the \: required \: average \: speed \: is \: given \: by \: the \: formua \\ \\ average \: speed \: = \: 2xy \div x + y \\ \\ where \: \\ x = 84 \: kmph \\ y = 56kmph \\ \\ average \: speed \: = \: 2 \times 84 \times 56 \div 84 + 56 \\ ans. \: is \: 67.2 \: kmph$