7- In a meat processing plant, 2-cm-thick steaks (k=0.45W/mK and =0.91107m2/s) that are initially at 25C are to be cooled by passing them through a refrigeration room at 211C. The heat transfer coefficient on both sides of the steaks is 9W/m2K. If both surfaces of the steaks are to be cooled to 2C, determine how long the steaks should be kept in the refrigeration room. Solve this problem using analytical one-term approximation method (not the Heisler charts)