Answer:
avg wind speed: 25 mph
avg airspeed: 175 mph
Explanation:
speed with wind: 200mph
speed against wind: 150 mph
x: avg airspeed
y: avg wind speed
with wind: x+y=200
against wind: x-y=150
add the equations to get 2x=350
solve for x:
x=175
plug 175 in for x to get y=25