Caleb took a two and one-half hour nap after soccer practice on Saturday afternoon. His younger brother slept one and three-fifths times as long as Caleb. How many hours did his brother sleep?
2 1/2 * 1 3/5
5/2 * 8/5 = 40/10 = 4 hours
5/2 * 8/5 = 40/10 = 4 hours