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Setiap menit, selang 1 dan 2 bisa mengisi 40 + 35 = 75 liter.
t = volume/debitt = 12000/75 = 160 menit = 2 jam 40 menit
5.volume = 600 litert = 15 menit
volume = 240 liter --> t = ?
240/600 x 15 = 6 menit.