A dog chases a rabbit. At the beginning of the chase, the distance between the dog and the rabbit is 30 meters. After chasing 48 meters, the distance between the dog and the rabbit is still 6 meters. How many meters does the dog need to chase to catch up with the rabbit?
狗追兔子，开始追时，狗与兔子相距30米，追了48米后，与兔子的距离还有6米，狗还需要追多少米才能追上兔子．
<gadget id="calculator">30 - 6</gadget>
<output>24</output>

<gadget id="calculator">48 / 24</gadget>
<output>2</output>

<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<result>12</result>