tolong dijawab beserta caranya,,,,no 22 plisssss

V=18m3 = 18000 dm3=18000 liter
waktu yang diperlukan:
18000 : (90+60)
18000: 150
=120 menit (A)

dm³=liter

18m³ = 18 x 1000 dm³
         = 18000 dm³
         = 18000 liter

90 liter/menit + 60 liter/menit = 150 liter/menit

[tex] \frac{18000 liter}{150 liter/menit} [/tex] = 120 menit