In order to beautify the campus, the school places a colorful flag every 10 meters from the beginning to the end of the playground. A total of 60 flags are needed. How long is the playground?
为美化校园，学校在操场边从头到尾每隔10米插一面彩旗，一共需要60面，操场长多少米？
<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<gadget id="calculator">59 * 10</gadget>
<output>590</output>

<result>590</result>