The tortoise and the rabbit race, the whole distance is 1800 meters, the tortoise climbs 15 meters per minute, and the rabbit runs 400 meters per minute. After the starting gun is fired, the rabbit leaves the tortoise far behind. The proud rabbit thinks it runs fast, and it is beautiful on the way He took a nap, and when the tortoise reached the finish line, the rabbit was still 200 meters away from the finish line. How much time did the rabbit sleep on the way?
龟、兔赛跑，全程1800米，乌龟每分钟爬15米，兔子每分钟跑400米，发令枪响后，兔子一会儿就把乌龟远远甩在后边，骄傲的兔子自以为跑得快，在途中美美的睡了一觉，结果乌龟到达终点时，兔子离终点还有200米．兔子在途中睡了多少时间？
<gadget id="calculator">1_800 / 15</gadget>
<output>120</output>

<gadget id="calculator">1_800 - 200</gadget>
<output>1_600</output>

<gadget id="calculator">1_600 / 400</gadget>
<output>4</output>

<gadget id="calculator">120 - 4</gadget>
<output>116</output>

<result>116</result>