and B start running at the same time on the circular runway. B's starting point is in front of A. A runs 4.5 meters per second, and B runs 4 meters per second. After running a lap, A still fails to catch up with B. At this time, it has passed 80 seconds. A is in a hurry, increases the speed to 5 meters per second, and runs a lap before catching up with B. How many meters in front of A is B's starting point when starting?
甲乙两人在环形跑道上同时起跑，乙的出发点在甲的前方，甲每秒跑4.5米，乙每秒跑4米，甲跑了一圈后，还是没有追上乙，这时已经过去了80秒．甲着急了，把速度提高到每秒5米，又跑了一圈才追上乙，那么起跑时乙的出发点在甲前方多少米？
<gadget id="calculator">4.5 - 4</gadget>
<output>0.5</output>

<gadget id="calculator">80 * 0.5</gadget>
<output>40</output>

<gadget id="calculator">80 * 4.5</gadget>
<output>360</output>

<gadget id="calculator">360 / 5</gadget>
<output>72</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">72 * 1</gadget>
<output>72</output>

<gadget id="calculator">40 + 72</gadget>
<output>112</output>

<result>112</result>