10. (3 points) The expressway from Lishan Town to the provincial capital is 189 kilometers long, passing through the county town. The county town is 54 kilometers away from Lishan Town. At 8:30 AM, a bus departs from Lishan Town to the county town, arriving at 9:15. After a 15-minute stop, it continues to the provincial capital, arriving by 11:00 AM. Another bus departs from the provincial capital directly to Lishan Town at 9:00 AM on the same day. It travels at 60 kilometers per hour. When the two buses meet, the bus traveling from the provincial capital to Lishan Town has been driving for \qquad minutes.
【Analysis】First, calculate the time the bus travels from 8:30 to 9:15, and based on the formula speed $=$ distance $\div$ time, find the speed of the bus from Lishan Town to the county. Then, calculate the time when the bus departs from the county and arrives at the provincial capital, and based on the formula speed $=$ distance $\div$ time, find the speed of the bus at this time; the bus arrives at 9:15. After staying for 15 minutes, it departs for the provincial capital, which is equivalent to the bus starting at 9:30. According to the formula distance $=$ speed $\times$ time, calculate the distance another bus travels in 30 minutes, then find the distance both buses travel together, and finally, based on the formula time $=$ distance $\div$ speed, find the meeting time of the two buses, and add 30 minutes to get the answer.

【Solution】Solution: $9:15 + 15$ minutes $= 9:30$,
$$
\begin{array}{l}
11:00 - 9:30 = 1.5 \\
30 \text{ minutes} = 0.5 \text{ hours,} \\
(189 - 54) \div 1.5, \\
= 135 \div 1.5, \\
= 90 \text{ (km),}
\end{array}
$$
$$
\begin{array}{l}
189 - 54 - 60 \times 0.5, \\
= 189 - 54 - 30, \\
= 135 - 30, \\
= 105 \text{ (km),} \\
105 \div (60 + 90), \\
= 105 \div 150, \\
= 0.7 \text{ (hours)} \\
= 42 \text{ (minutes),} \\
42 + 30 = 72 \text{ minutes,}
\end{array}
$$

Answer: The bus traveling from the provincial capital to Lishan Town has traveled for 72 minutes, so the answer should be: 72.