For a children's car, the diameter of the front wheel is 0.3 meters, and the diameter of the rear wheel is 0.24 meters. If the front wheel turns 12 times, how many times does the rear wheel need to turn?
一种儿童车，前轮直径为0.3米，后轮直径为0.24米，前轮转12圈前进的路程，后轮需转多少圈？
<gadget id="calculator">0.3 * 12</gadget>
<output>3.6</output>

<gadget id="calculator">3.6 / 0.24</gadget>
<output>15</output>

<result>15</result>