10 cars lined up through a 300-meter tunnel. Each car is 4 meters long, and the distance between two cars is 8 meters. The convoy advances 103 meters per minute. How many minutes does it take from the convoy entering the tunnel to the last car leaving the tunnel?
10辆汽车排成一列经过一个300米的隧道．每辆车长4米，两车之间隔8米，车队每分钟前进103米，从车队进隧道到最后一辆车离开隧道共需几分钟？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">72 + 40 + 300</gadget>
<output>412</output>

<gadget id="calculator">412 / 103</gadget>
<output>4</output>

<result>4</result>