Question

An airplane takes 4 hours to travel a distance of 2400 miles with the wind. The return trip takes 5 hours against the wind. Find the speed of the plane in still air and the speed of the wind.

Answer 1

travel with the wind
v+w=d/+1
v+w=3600/4
v+w=900
travel against the wind
v-w=d/+2
v-w=3600/5
v-w=720

v+w=900
v-w=720

speed of the plane in the air is 810 mph
speed of the wind is 90 mph