Consider a two-stage CASCADE refrigeration system operating between the

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Consider a two-stage cascade refrigeration system
operating between the pressure limits of 0.8 and 0.14 MPa.
Each stage operates on the ideal vapor-compression refrigeration
cycle with refrigerant-134a as the working fluid.
Heat rejection from the lower cycle to the upper cycle takes
place in an adiabatic counterflow heat exchanger where both
streams enter at about 0.4 MPa. If the mass flow rate of the
refrigerant through the upper cycle is 0.24 kg/s, determine
-(a) the mass flow rate of the refrigerant through the lower cycle,
-(b) the rate of heat removal from the refrigerated space
and the power input to the compressor, and
-(c) the coefficient of performance of this cascade refrigerator.

This video is for a Thermodynamics class
Mechanical Engineering
Problem: 11-56
Textbook : Thermodynamics an engineering approach, Yunus A Cengel, 8th Edition

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