Three cubes of equal side length of steel, lead, and copper, are arranged between heat reservoirs at 150 degrees Celsius and 0 degrees Celsius. The…

Three cubes of equal side length of steel, lead, and copper, are arranged between heat reservoirs at 150 degrees Celsius and 0 degrees Celsius. The heat current between the reservoirs is 175 W.

What is the length of the side of a cube?

What is the temperature at the junction between steel and lead cubes?