The cat runs 2 steps and the mouse needs to run 10 steps, while the cat runs 3 steps and the mouse can run 4 steps. The cat chases the mouse 11 steps behind the mouse, so how many steps can the cat run at least to catch up with the mouse?
猫跑2步的路程老鼠要跑10步，而猫跑3步的时间老鼠可以跑4步，猫在老鼠后11步处追老鼠，则猫最少跑多少步可以追上老鼠．
<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<gadget id="calculator">11 / 11</gadget>
<output>1</output>

<gadget id="calculator">1 * 15</gadget>
<output>15</output>

<result>15</result>