So you have to find how many seconds it takes to fill up with 1 inch. TO find that, you have to divide 45/3 which equals to 15. So it takes 15 seconds for 1 inch. The question is asking you to find out how many seconds will it take to fill the tub with 20 inches. SO your gonna multiply 15*20. 15*20 = 300 So it would take 300 seconds to fill up Camden's tub.
