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Waktu lilin terbakar
=Volume ÷ kecepatan bakar
=¼πd²t ÷ k
=¼ . 3,14. 3². 20 ÷ 2
=565,2/8
=70,65 menit
=1 jam 10 menit 39 detik
semoga membantu
-alya❤