Turbine bleed steam enters an open feedwater heater of a regenerative Rankine cycle at 40 psia and

Question:

Turbine bleed steam enters an open feedwater heater of a regenerative Rankine cycle at 40 psia and 280°F while the cold feedwater enters at 110°F. Determine the ratio of the bleed steam mass flow rate to the inlet feedwater mass flow rate required to heat the feedwater to 250°F.