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Volume Bak
= 1/4πd²t
= 1/4 x 22/7 x 7² x 20
= 770 liter
Waktu yang diperlukan sampai habis
= 770 liter / 5 liter/menit
= 154 menit
V = πr²t
V = 22/7 × 3,5 × 3,5 × 20
V = 770 liter
Waktu = 770 / 5 = 154 menit [ Opsi A ]