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18=2×3×3
20=2×2×5
kpk=2×2×3×3×5=180 menit
18 = 2 × 3²
20 = 2³ ×3
KPK = 2³ ×3² ×5
= 8 × 9 × 5
= 360 menit ÷ 60
= 6 Jam
Jadi, 360 menit ( 6 Jam ) ketiga lampu akan menyala bersama