An airplane travels 260 miles per hour into a 50 mile per ho

An airplane travels 260 miles per hour into a 50 mile per hour head wind. On the return trip the wind has slowed to 25 miles per hour and the plane averages 335 miles per hour. How fast would the plane have gone with no wind on either leg?

Solution

260+50=310
335-25=310
310 with no wind
commercial jets fly at about 500