A process involves preparing a salt solution using three connected continuously stirred tanks. Each tank contains 1000 litres of water in which tank A flows into B, which flows into C, which in turn...

A process involves preparing a salt solution using three connected continuously stirred tanks. Each tank contains 1000 litres of water in which tank A flows into B, which flows into C, which in turn flows back into A. The flow between tanks is maintained at 50 litres per minute. If tanks A and C initially contain a solution of salt with concentrations of 3 and 6 grams per litre, respectively, while tank B vessel contains only water, determine the time for tank B to reach a final concentration of 2.9 g L^–1.