The tortoise and the rabbit race, the whole distance is 800 meters, and the rabbit can run the whole distance in 4 minutes. The speed of the tortoise is slower than that of the rabbit (19/20). Thinking that he ran fast, he took a good night's sleep on the way, but when the tortoise reached the finish line, the rabbit was still 100 meters away from the finish line. How many minutes did the rabbit sleep on the way?
龟、兔赛跑，全程800米，兔子4分钟就可以跑完全程，乌龟的速度比兔子慢(19/20)，法令枪响后，兔子一会儿就把乌龟远远甩在后面，骄傲的兔子自以为跑得快，在途中美美的睡了一觉，结果当乌龟跑到终点时，兔子离终点还有100米．求兔子在途中睡了多少分钟？
<gadget id="calculator">800 / 4</gadget>
<output>200</output>

<gadget id="calculator">19 / 20</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">200 * (1/20)</gadget>
<output>10</output>

<gadget id="calculator">800 / 10</gadget>
<output>80</output>

<gadget id="calculator">800 - 100</gadget>
<output>700</output>

<gadget id="calculator">700 / 200</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">80 - (7/2)</gadget>
<output>153/2 = around 76.5</output>

<result>153/2 = around 76.5</result>