When the workers measure the road, they first set up a pole at the starting point, and then set up one pole every 40 meters. There are nine poles already erected. Calculate how many meters are the distance between the first pole and the nine poles?
工人测量公路时，先在起点立一根标杆，以后每隔40米立一根，已经立了九根，算一算第一根到底九根相距多少米？
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<result>320</result>