Question

Tyler painted a wall with a length of 28 feet and a width of 12 feet in 5 1/4 hours.

What is the speed, in square feet per hour, at which Tyler painted the wall?

Answer 1

First we have to solve for the area of the wall.

The area of a rectangle is A=l*w

A=l*w
A=28*12
A=336 ft²

So 336 square feet were painted in 5 1/4 hours. How many square feet were painted in one hour?

Given the info, the following equation can be made.

$\frac{5 \frac{1}{4} hour}{336 sq ft}= \frac{1 hours}{x sq feet}$

Cross multiply

5 1/4x=336
divide both sides by 5 1/4
x=64ft

In one hour, 64 square feet were painted.

Tyler painted 64 square feet per hour