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p=4m
l=3m
t=?
v = p x l x t
40 = 4 x 3 x t
40 = 12t
t = 40/12
t = 10/3
p x l x t = 40
4 x 3 x t = 40
12 t = 40
t = 40/12
t = 3,3 cm