Solution-1 containing 10% nitric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 40% nitric acid flowing at the rate 5 Kg/min, if their product contains 30% nitric acid, what is the flow rate of product?

Correct Answer: 10 Kg/min
Equation of material balance, 0.1(10) + 0.4(5) = 0.3(x), => x = 10 Kg/min.