There is a 400-meter circular runway on the sports field. How many colored flags should be inserted in total if a colored flag is inserted every 10 meters?
运动场上有一条为400米的环形跑道．每隔10米插上一面彩旗，一共要插多少面彩旗？
<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<result>40</result>