Question

a train travels 360 km at a uniform speed had been 5km /h more, it would have taken one hour less for same journey find the speed of the train .

Answer 1

1 = (360/X) -(360/(X+5))
(1/360) = 5/(x^2+5x)
x^2+5x = 360*5
on solving answer is 40 km/h.