Question 837279
let x be the rate of the airplane, y be the rate of the wind
therefore we have the following two equations
(x-y)*6 = 900    note that * means multiply and rate*time = distance
(x+y)*5 = 900
solve first equation for x and substitute in second equation
x-y = 150
x = 150+y
(150+y+y)*5 = 900
2y = 180 - 150
2y = 30
y = 15
x-15 = 150
x = 165
the speed of the airplane is 165 mph and speed of the wind is 15 mph