If a plane can travel 480 miles per hour with the wind and 400 miles per hour against the wind, find the speed of the wind and the speed of the plane in still air.

Let "p" be speed of plane in still air.

Let "c" be speed of the wind.

Equations:

p + c = 480 mph

p - c = 400 mph

Add and solve for "p":

2P = 880

p = 440 mph (speed of the plane in still air)

b. b < 1 might be the correct answer

you need to give more info