Hot strong, coffee enters a mixing tank with a temperature of 70. oC , 1 atm at a rate of 1.0 liter/minute. A second feed contains cold, sweetened milk at 4.0 oC , which enters the mixer with a rate of 0. 10 l/min. The third feed contains crushed ice (00C) entering the mixer with a rate of 2.0 kg/ min. The product stream contains the ready to serve ice-coffee, which contains liquid and crushed ice. A stirrer introduces a work of 1.0 kW to the mixing tank, while 0.50 kW of heat is transported into the tank due to a lack of suitable insulation.

Calculate the mass fraction of ice in the ice-coffee (product stream).