cat found a little mouse sneaking around 16 meters in front of it, and immediately rushed over at a speed of 10 meters per second, while the mouse ran away at a speed of 6 meters per second. So how long does it take for the cat to catch up with the mouse?
一只猫发现在它前方16m远的地方有一只小老鼠正鬼鬼祟祟地探路，马上以每秒10m的速度扑了过去，老鼠则以每秒6m的速度逃命．那么经过多长时间猫能追上老鼠？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>