Question 299622
let speed of plane in still air bex

and wind rate be y

2400 / x-y = 6

2400/6 = x-y

400 = x-y

2400 / x+y=5

x+y = 480

x-y+ x+y = 480+400

2x=880

x=440 mph  rate of plane in still air

so y= 40 mph rate of wind