The tortoise and the hare race, the whole journey is 5.4 kilometers. The rabbit runs 25 kilometers per hour, and the tortoise runs 4 kilometers per hour. The tortoise keeps running, but the rabbit runs and plays. It first runs for 1 minute, then plays for 15 minutes, then runs for 2 minutes, and plays for 15 minutes. Then run for 3 minutes, play for 15 minutes, ..., so how much faster is the one who reaches the finish line first than the one who reaches the finish line later.
龟兔赛跑，全程5.4千米．兔子每小时跑25千米，乌龟每小时跑4千米，乌龟不停地跑，但兔子却边跑边玩，它先跑1分，然后玩15分，又跑2分，玩15分．再跑3分，玩15分，…，那么先到达终点的比后到达终点的快多少分．
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">12.96 + 60</gadget>
<output>72.96</output>

<gadget id="calculator">81 - 72.96</gadget>
<output>8.04</output>

<result>8.04</result>