Final answer:
Category 3 UTP can transmit data at a maximum speed of 10 Mbps, which is relatively slow compared to modern networking cables.
Step-by-step explanation:
The maximum speed at which Category 3 Unshielded Twisted Pair (UTP) can transmit data is 10 megabits per second (Mbps). This type of cabling was commonly used for computer networks in the early 1990s but is now considered obsolete for most modern network applications due to its relatively slow data transmission speed compared to newer standards such as Cat5e, Cat6, and Cat6a which support higher speeds up to 1000 Mbps or more.