row of colorful flags, the distance between every two colored flags is 10 meters, now changed to 15 meters. If the position of the flag at the starting point remains the same, how far apart can there be another colored flag without moving its position?
一排彩旗，每两面彩旗间的距离是10米，现在改为15米．如果起点的一面旗位置不变，那么至少间隔多远又有一面彩旗可以不用移动位置？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>