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V= 7m x 21m x 2m
V= 294m³
V=294000 litros
la segunda
A= perimetro x apotema
perimetro = 38cm x 6cm
perimetro= 228cm
A= 228cm x 21.4
A=4879.2 cm²
la tercera
transformamos 12dm a metros
12dm= 1.2m
por regla de tres
1.2m 8min
12m x
x= 12 x 8 / 1.2
x= 80 minutos (lo q se demoro en hacerlo)