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= (30 liter/menit + 15 liter/menit) x 10
= 45 liter/menit x 10
= 450 liter
8. volume = 2 liter/menit x 25
= 50 liter
9. a. 3/4 x 12 m³/menit = 9 m³/menit
b. volume = debit x waktu
volume pintu pertama = 9 m³/menit x 60
= 540 m³
volume pintu kedua = 12 m³/menit x 60
= 720 m³
jadi,volume kedua pintu adalah 540 m³ + 720 m³ = 1.260 m³