12. A king-sized inflatable rectangular bed when fully inflated will have inside dimensions, in inches, of 78 by 75 by 5. An air pump can pump air into the bed at a rate of 100 cubic inches per second. At that rate, which of the following is closest to the number of seconds it will take to fully inflate the bed?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

The volume of the inflatable bed is 78*75*5=29250 cubic inches, and the air pump can inflate 100 cubic inches per second, so it takes 29250/100=292.5 seconds to fill the bed; the closest is J