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Verified answer
1 liter = 0,001 m³1 jam = 60 menit
7,5 jam = 7,5 x 60 = 450 menit
120 l / menit x 7,5 jam =120 x 450 = 54.000 liter
= ( 54.000 : 1000 ) m³
= 54 m³