# Concentration spread

**Classical Mechanics**Level 3

A cylinder of volume of V liter , at the moment zero it has a 20 kg of salt and we drop salty water in a rate C the salt concentration in the salty water is B ,there is a hole in down of the cylinder it drops the water off by the same rate it comes in , find the total mass of the salt in the cylinder after 30 minutes.

details and assumptions; V=5000 liter C=0.03 kg/liter B=20 kg the salt spread very fast in the cylinder , you may consider its' concentration is homogeneous .

first published by p.Habib Issa .

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