On Monday, Jill used 1/2 quart of paint in 3/4 hour. On Tuesday, Jill was distracted by texting and used 1/2 quart of paint in 5/4 hour. What is the difference in her usage rates in quarts per hour?

Answer 1

1/2 per 3/4 hour = (4/3)(1/2) = 2/3 per hour

1/2 per 5/4 hour = (4/5)(1/2) = 2/5 per hour

difference = 2/3 - 2/5 = 10/15 - 6/15 = 4/15

or .666...- .4 = 0.2666....quarts per hour difference