A student investigates the power output of three different model electric motor systems, X, Y, and Z, lifting a load. The results are shown in the table below.
| Model | Pulling force in N | Distance in m | Work done in J | Time taken in s | Power in W |
|---|---|---|---|---|---|
| X | 20.5 | 4.0 | 82.0 | 5.0 | 16.4 |
| Y | 4.0 | 90.5 | 5.0 | 18.1 | |
| Z | 13.5 | 4.0 | 54.0 | 13.5 |
Use the data for all three models to calculate their average power.