Two automated logistics robots, Robot X and Robot Y, are programmed to navigate a straight 90-meter retrieval corridor in a fulfillment warehouse. The distance traveled from the start of the corridor is recorded at regular intervals for each robot.
| Time (s) | Distance (m) - Robot X | Distance (m) - Robot Y |
|---|---|---|
| 0 | 0 | - |
| 6 | 18 | 0 |
| 12 | 36 | 15 |
| 18 | 54 | 36 |
| 24 | 72 | 63 |
| 30 | 90 | 85 |
| 31 | - | 90 |
Calculate the constant velocity of Robot X during this test.