Question 855821
Your equation yields an answer of x = 80/23=3.4783 for the plane and a time of 190/(20-80/23)=23/2 = 11.5 hours
I have no idea how you got 20 from your equation.
You have 270/x+20 = 190/x-20
x is the speed of the plane and 20 is the speed of the wind
Subtract the wind from the plane not the plane from the wind.
Your equation is set up wrong. It is close but not right.
270/(x+20) = 190/(x-20) which yields 115 for x the speed of the plane