What are the two sizes of pumps in the tandem hydraulic system?

In a tandem hydraulic system, the size of the pumps plays a crucial role in determining the flow rate and efficiency of the hydraulic system. The correct sizes of pumps in this system are 31-gpm and 15-gpm, as indicated in the chosen answer. This configuration allows for a balance between high flow rates for lifting and lower flow rates for more controlled operations. The specific combination of these two flow rates is designed to meet the varying demands of hydraulic applications, ensuring versatility and reliability.

The other options provide different flow configurations that do not correspond to the standard sizes typically used in tandem hydraulic systems. They either exceed or do not meet the operational requirements needed for effective performance in a range of applications, which highlights the importance of selecting the appropriate pump sizes for optimal system function.