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= 1/(5/60)
= 60/5
= 12 hari
F => 1 hari => dapat 1/20 pek
A => 1 hari => dapat 1/30 pek
F+A => 1 hari => dapat 1/20+1/30 = 5/60 = 1/12 pek.
Waktu yg diperlukan = 1 (utuh) ÷ 1/12 = 1×12/1 = 12 hari
Semoga membantu, mohon maaf jika ada kesalahan^^