A plane traveled 400 miles to London and back.

Question

A plane traveled 400 miles to London and back. The trip there was with the wind. It took 4

hours. The trip back was into the wind. The trip back took 5 hours. Find the speed of the plane

in still air and the speed of the wind.

Answer 1

p represents the plan's speed

w represents the wind's speed

400 = 4(p + w)

400 = 5(p - w)

Can you solve for w (or p) and answer?