jeff can paint 28aquare feet every 15 minutes. Angela can paint 115 aquare feet every hours. Who can paint faster, and by how many square feet per hour?

Angela, by 3 ft² per hour

Step-by-step explanation:

Jeff can paint 4 times the area in 4 times the time, so

... (4*28 ft²) / (4*15 min) = 112 ft² / (60 min) = 112 ft²/h

Since 115 ft²/h is more than 112 ft²/h (by 3 ft²/h), Angela is the faster painter.