no 7,8,9 ya bantuin...pake caranya...

7. D = V/W
= 450l / 30 menit
= 15 l/menit
8. D = V/W
= 8 l/ 2menit
= 4 l/menit
9. V = D x W
= 32 l/menit x 23 menit
= 736 liter