A convoy of 20 vehicles is formed, each vehicle is 5 meters long, and the distance between two adjacent vehicles is 10 meters. How long is the caravan from start to finish?
由20辆车组成的一个车队，每辆车长5米，相邻两辆车之间的距离为10米．这个车队从头到尾共长多少米．
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">10 * 19</gadget>
<output>190</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">190 + 100</gadget>
<output>290</output>

<result>290</result>