Power plant question, please solve it in detail, thank you

A mass flow of 1kg/s of seawater is desalinated by an MSF thermal desalination unit (single flash distillation, fig). Seawater pumped at a temperature of 20C is conveyed to a heat exchanger, and it exits at 100C as a saturated liquid. The heating of seawater in the heat exchanger is done by the latent heat of saturated steam that enters at 105C. The flash tank is at 70C. Using the thermodynamic tables for water, calculate: 1. The recovery ratio RR 2. The Performance ratio PR. 3. The mass flow rate of the distillate 4. The mass flow rate of the brine