A plane flies 390 miles with the wind and 325 miles against the wind in the same length of time. If the speed of the wind is 10 mph, find the speed of the plane in still air.

Question

The speed of the plane in still air is blank mph

I got 110 mph

Is that correct?

Answer 1

Tor, yes, that is correct--did you set up two equations and solve, or "guess and check?"

(rate)(time) = distance

(x + 10)(t) = 390

(x - 10)(t) = 325

then solve. The hard part is setting up the equations, not too hard to solve