Problem on Kelvin-Plank Statement, Second law of Thermodynamics/Heat supplied & Thermal efficiency

A reversible engine is supplied with heat from two constant temperature sources at 900 K and 600 K and rejects heat to the constant temperature sink at 300 K. The engine develops work equivalent to 90 kJ/s and rejects heat at the rate of 56 kJ/s

Estimate

1. Heat supplied by each source
2. Thermal efficiency of the engine

ProblemKelvin-PlankStatement,