Question

An airplane flew 3.5 hours with a 40 mph head wind. The return trip with a tail wind of the same speed took 2.5 hours. Find the speed of the plane in still air.

240 mph

220 mph

200 mph

180 mph

Answer 1

Because the plane is traveling an equal distance both ways, you'll want to solve for x as follows: \[3.5(x-40)=2.5(x+40)\]\[3.5x-140=2.5x+100\]\[x=240\]
The answer is 240 mph.

Answer 2

Thanks!

Answer 3

Yes, correct!