Solve.
-A certain aircraft can fly 912 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. What is the speed of the wind?
A) $57 \mathrm { mph }$
B) $19 \mathrm { mph }$
C) $38 \mathrm { mph }$
D) $76 \mathrm { mph }$

Question

Quizplus · Accepted Answer

The speed of the aircraft in still air is the average of the speeds with and against the wind. With the wind, the speed is 912 miles / 4 hours = 228 mph. Against the wind, the speed is 912 miles / 6 hours = 152 mph. The average speed in still air is (228 + 152) / 2 = 190 mph. The wind speed is the difference between the speed with the wind and the speed in still air, which is 228 - 190 = 38 mph.

Solve -A Certain Aircraft Can Fly 912 Miles with the Wind

Solve
-A Certain Aircraft Can Fly 912 Miles with the Wind