<span>3 feet make 1 yard.
40 feet make 13 and 1/3 yards
So that is 13 yards to nearest </span>
Let the speed of plane in still air be x and that wind be y
therefore:
x+y=490
x-y=390
next we solve for the values of x and y, first we add the above equations. This will give us:
2x=880
x=880/2
x=440 miles per hour.
substituting the value of x in one of the equations and solving for y we get:
440+y=490
y=490-440
y=50 miles per hour
It maybe be B if i am wrong i am sorry.
I am not sure sorry about that
ANSWER
See attachment.
EXPLANATION
The given inequality is

Divide both sides by 3 to get,


Because the inequality involves '<' we use a hollow circle at 2⅔.
The solution set of this inequality is shown on the number line in the attachment.