an airplane travel 3550 km against the wind in 5 hours and 4200 km with the wind in the same amount of time . what is the rate of the plane in still air and what is the rate of the wind ?

Answer 1

3550 = (R-s)*5 = 5r - 5s

4200 = (R+s)* 5 = 5r + 5s

7750 = 10r

r = 775

3550 = 5(775) - 5s

3550 = 3875 - 5s

-325 = -5s

s = 65

Speed of the plane is 775, speed of the wind is 65