3. (6 points) A car, after starting, first traveled 18 kilometers in 24 minutes, then continued at a speed of 72 kilometers per hour for another 35 minutes to reach its destination. The car's average speed per minute is approximately $\qquad$ kilometers (round the answer to two decimal places).
3. (6 points) A car, after starting, first travels 18 kilometers in 24 minutes, then travels for another 35 minutes at a speed of 72 kilometers per hour to reach its destination. The car's average speed per minute is approximately $\qquad$ kilometers (round the answer to two decimal places).

【Solution】Solution: 1 hour $=60$ minutes,
$$
\begin{aligned}
& (72 \div 60 \times 35+18) \div(24+35), \\
= & 60 \div 59, \\
\approx & 1.02 \text { (kilometers); }
\end{aligned}
$$

Answer: The car's average speed per minute is approximately 1.02 kilometers;
Therefore, the answer is: 1.02.