The tortoise and the hare run a race of 2000 meters, the tortoise climbs 25 meters per minute, and the rabbit runs 320 meters per minute. The rabbit thought it was fast, and fell asleep on the way, but when the tortoise reached the finish line, the rabbit was still 400 meters away from the finish line. How many minutes did the rabbit sleep on the way?
龟兔赛跑，全程2000米，龟每分钟爬25米，兔每分钟跑320米．兔自以为速度快，在途中睡了一觉，结果龟到终点时，兔离终点还有400米，兔在途中睡了几分钟？
<gadget id="calculator">2_000 / 25</gadget>
<output>80</output>

<gadget id="calculator">2_000 - 400</gadget>
<output>1_600</output>

<gadget id="calculator">1_600 / 320</gadget>
<output>5</output>

<gadget id="calculator">80 - 5</gadget>
<output>75</output>

<result>75</result>