Jack spends 1 1/2 as long on his homework as jill. last week jill spent 9 1/2 hours doing homework. how long did jack spend doing his homework?

The amount of time Jill spent to do her homework 
= 9 1/2 hours. which equals to  570 minutes.

Which means, the amount of times Jack needed to do his is 
= 570 minutes x 1.5
= 855 minutes which equals to 14 1/4 hours

hope this helps

Ithink the answer would be knew