10. (3 points) 60 adventure team members need to cross a river. There is only one rubber boat on the river that can carry 6 people (a round trip counts as two times), and it takes 3 minutes to cross the river once. The total time required for all team members to cross to the other side of the river is $\qquad$ minutes.
【Solution】Solution: $(60-6) \div 5$,
$$
\begin{array}{l}
=54 \div 5, \\
\approx 11 \text { times, } \\
3 \times(11 \times 2+1), \\
=3 \times 23, \\
=69 \text { (minutes) },
\end{array}
$$

Answer: It takes a total of 69 minutes for all team members to cross to the other side of the river. Therefore, the answer is: 69.