Matthew read 3/8 of a chapter of his history book in 1/5 of an hour. At this rate how many chapters of his history book can he read in 1 1/2 hours

Question

Matthew read 3/8 of a chapter of his history book in 1/5 of an hour. At this rate how many chapters of his history book can he read in 1 1/2 hours

Answer 1

3/8 in 1/5 hour means 15/8 in 1 hour and 7.5/8 in 1/2 an hour

so 1 1/2 hour would mean (15+7.5)/8 = 22.5/8 = 45/16 = 2 13/16 chapters in 1 1/2 hours

or = 2.8125 chapters in 1.5 hours