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t₂ = 2 jam 55 menit ⇒ 2 55/60 ⇒ 2 11/12 ⇒ 35/12 jam
Waktu pengerjaan bersama = t
1/t = 1/t₁ + 1/t₂
1/t = 1 / [13/4] + 1 / [35/12]
1/t = 4/13 + 12/35
1/t = [4.35 + 12.13] / [13.25]
1/t = [140 + 156] / 325
1/t = 296 / 325
∴ t = 325/296 jam