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V.tabung = πr².t
= 22/7(6)².(10)
= 1130,4
V.besi = 22/7(3)²(10)
= 282,6
V.air = 1130,4 - 282,6
= 847,6
πr²t = 847,6
22/7(6)².t = 847,6
t = 847,6/113,14
t = 7,49