Question

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

Answer 1

Total area of the wall = 28 * 12 = 336 ft²

time = 5 1/4 = 21/4 hours

speed = 336 / 21/4 = 64 ft²/hour

Answer 2

First you multiply the length times the width or 28 by 12 to get 336
divide 336 by 5.5 to get your answer
61.09 square feet per hour

actually ignore me, above guy is right