1.4 hours cause 560/400 =1.4
Area of a triangle is,

Substitute the numbers,


The above number is the base.
Using the pythagorean method let's calculate for "c" the hypotenuse.

Substitute

Solve,

Simplify,

Calculate one last time,

The hypotenuse is 37 inches.
A = LW for W
A/L = LW/L = A/L=W
/ = fraction bars but i couldn't use fraction bars
hopefully this helped ! :)