Please help me so i can understand how you solve these problems.

How much coal did each miner have to remove from the mine each day to ensure that a cage full of men could leave the mine at the end of a shift? How does this compare with his own weight? (I wonder if this is where the expression "pulling his weight" comes from?). a) Visualize the system. There are many processes to this operation. Draw a schematic, showing each separate process unit, how they are all connected, and what the inputs and outputs are in terms of mass, energy, and wor (please no numbers here yet!). Label all process units and define all variables, with units. b) Analyze. What goes on in each of the process units? Explain in words. Define "efficiency" for each of the process units, and list any factors you think will contribute to that efficiency being