In a thread-winding machine, a motor turns gear A. The teeth of gear A interlock with gear B, and the teeth of gear B interlock with gear C.
| Gear | Number of teeth |
|---|---|
| A | 16 |
| B | 40 |
| C | 24 |
Gear A rotates clockwise at 90 revolutions per minute.
Calculate the rate of rotation of gear B.
Calculate the rate of rotation of gear C.
Explain how the direction of rotation of gear C compares with the direction of rotation of gear A.