racing experiment is carried out in the laboratory of an automobile manufacturer. Two racing cars A and B are running towards each other from both ends of a track 200 meters apart at the same time. The speed of both cars is 1 meter per second. There is a signal car between the two cars, which drives from car A to car B at a speed of 5 meters per second; when it encounters car B, it returns to car A... so it keeps going back and forth between the cars A and B. When cars A and B are 10 meters apart, how many meters has the signal car traveled in total?
在某汽车制造厂的实验室里进行赛车实验，甲、乙两辆赛车从相距200米的轨道两端同时相向而行，两车速度都是每秒1米．在两车之间有一辆信号车，以每秒5米的速度从甲车开向乙车；遇到乙车又返回开向甲车…如此不停地往返于甲、乙两赛车之间．当甲、乙两车相距10米时，信号车一共行了多少米．
<gadget id="calculator">200 - 10</gadget>
<output>190</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">190 / 2</gadget>
<output>95</output>

<gadget id="calculator">95 * 5</gadget>
<output>475</output>

<result>475</result>