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= 120cm x 90cm x 50cm
= 540.000 cm3
= 540 liter
debit = volume/waktu
18 = 540/t
t = 540/18 = 30 menit (A)
20. luas 1 balok tanpa tutup :
= pl + 2lt + 2pt
= 50x30 + 2x30x40 + 2x50x40
= 1500 + 2400 + 4000
= 7900 cm2
tripleks yang dibutuhkan untuk 5 balok = 5 x 7900 = 39500 cm2 = 3,95 m2 (D)