In a mountain climbing competition, Xiaosong went up the mountain at 50 meters per minute, reached the top of the mountain in 18 minutes, and then went down the mountain on the same road at 75 meters per minute. How many minutes did it take him to go down the mountain?
在一次爬山比赛活动中，小松上山时每分钟走50米，18分钟到达山顶，然后按原路下山，每分钟75米，他下山需要几分钟？
<gadget id="calculator">18 / 75</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">50 * (6/25)</gadget>
<output>12</output>

<result>12</result>