I need help finding the speed and velocity of the plane

Question

A small plane flew 903 miles in 3.5 hours with the wind. Then on the return trip, flying against the wind, it traveled only 588 miles in 3.5 hours. What were the wind velocity and the speed of the plane? (Note: The "speed of the plane" means how fast the plane would be flying with no wind.)

Answer 1

p +w = 903/3.5

p -w = 588/3.5

add

2p = (903+588)/3.5 = 1492/3.5

p = 1492/3.5 = about 426.3 mph = plane's speed with no wind