The tortoise and the hare run a race of 2000 meters, the tortoise crawls 25 meters per minute, and the rabbit runs 320 meters per minute. The rabbit thought he was running fast, so he fell asleep on the way. Ask the rabbit how long it will sleep before arriving at the same time as the tortoise.
龟兔赛跑，全程2000米，乌龟每分钟爬行25米，兔子每分钟跑320米．兔子自以为跑得快，在途中睡了一觉．问兔子睡多长时间才会和乌龟同时到达．
<gadget id="calculator">2_000 / 25</gadget>
<output>80</output>

<gadget id="calculator">2_000 / 320</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">80 - (25/4)</gadget>
<output>295/4 = around 73.75</output>

<result>295/4 = around 73.75</result>