At maximum speed, an airplane tracked 1720 miles against the wind in 5 hours. flying with the wind, the plane can travel the same distance in 4 hours. let x be the maximum speed of the plane and y be the speed of the wind. what is the speed of the plane with no wind?

Recall your d = rt, distance = rate * time.

as the plane goes against the wind, the plane is not really flying at "x" mph, but is really going slower, at " x - y ", because the wind is subtracting speed from it.

likewise, when the plane is going with the wind, is not really going at "x" mph, but at " x + y ", is going faster due to the wind, thus