An airplane flies 600 miles with a tail wind in 2.0 hrs.If it takes 2.5 hrs to cover the same distance against the headwind,then what is the speed of the plane in still air?
A)270 mph
B)300 mph
C)240 mph
D)330 mph
E)250 mph

Question

Quizplus · Accepted Answer

The speed of the plane in still air is the average of the speeds with and against the wind. The speed with the wind is 600 miles / 2.0 hrs = 300 mph. The speed against the wind is 600 miles / 2.5 hrs = 240 mph. The average speed is (300 mph + 240 mph) / 2 = 270 mph.

An Airplane Flies 600 Miles with a Tail Wind in 2.0