The cat chases the mouse. It turns out that they are 25 meters apart. After running 50 meters, the cat is 5 meters away from the mouse. How many meters does the cat have to run before it catches up with the mouse?
猫追老鼠，原来它们相距25米，猫跑了50米后与老鼠相距5米．猫还要跑多少米就可以追上老鼠？
<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">50 / 20</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 5</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>