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Verified answer
V = 30 m³= 30 x 1.000.000 cm³
= 30.000.000 cm³
Q = 40.000 cm³/12 detik
t = V : Q
= 30.000.000 cm³ : 40.000 cm³/12 detik
= 750 x 12 detik
= 9.000 detik
= 9.000 : 3.600
= 2,5 jam