A hunting dog found a fox running 18 meters away from it, and it immediately chased after it. The distance that the hound runs 2 steps, the fox takes 3 steps, and the time the hound takes 5 steps, the fox can run 7 steps. How far can the hound run to catch up with the fox?
一只猎狗发现在离它18米远的前方有一只狐狸在跑，它马上紧追．猎狗跑2步的路程狐狸要跑3步，而猎狗跑5步的时间，狐狸可跑7步．猎狗跑多少米能追上狐狸？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">15 / 14</gadget>
<output>15/14 = around 1.071429</output>

<gadget id="calculator">1 / (15/14)</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">1 - (14/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">18 / (1/15)</gadget>
<output>270</output>

<result>270</result>