Reference answer: 58/3
94. There are three cars $A$, $B$, and $C$ that start from the same location at the same time, driving along the same road. They catch up to Xiaolong, who is riding in the same direction, at 5 minutes, 10 minutes, and 12 minutes, respectively. It is known that the speed of $A$ is 24 kilometers/hour, and the speed of $B$ is 20 kilometers/hour. Then the speed of $C$ is $\qquad$ kilometers/hour.