Question 580321
let the distance be y

speed of plane in still air be x

withwind speed = x+22
against wind speed = x-22

time with wind = 6 hours
time against wind = 8 hours
distance = speed & time

(x+22)6 =Y
(x-22)*8 y

(x+22)*6 = (x-22)*8

6x+132=8x-176

8x-6x=132+176
2x=308
/2
x= 154

Speed of plane in still air = 154 mph