Question

Flying against the wind, an airplane travels 2280 km in 4 hours. Flying with the wind, the same plane travels 6650 km in 7 hours. What is the rate of the plane in still air and what is the rate of the wind?

Answer 1

speed = dis / time

let plane speed in still air is X  and air speed Y

so,  X-Y = 2280/4  = 570 km/h

and X+Y = 6650/7 = 950 km/h

so, X = (570 + 950) / 2 = 760 km/h 

and Y = 950- 760 = 190 km/h 

:)