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200 = 1/3 ×(alas × t) × t
200 = 1/3 ×(15×8) × t
t = 600/120 = 5cm
200cm3=1/3 × 15 × 8 × t
200cm3=1/3 × 120 × t
200cm3=40 × t
t = 200cm3 : 40
t = 5