The distance between A and B is 10,000 meters. A rides a bicycle and B walks from A to B at the same time. A’s speed is 4 times that of B’s. On the way, A’s bicycle breaks down and repairs are delayed for a while. When B arrives at point B, A is still 200 meters away from point B. How many meters did B walk while A was repairing the car?
A、B两地相距10000米，甲骑自行车，乙步行，同时从A地去B地．甲的速度是乙的4倍，途中甲的自行车发生故障，修车耽误了一段时间，这样乙到达B地时，甲离B地还有200米．甲修车的时间内，乙走了多少米？
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">10_000 / 4</gadget>
<output>2_500</output>

<gadget id="calculator">50 - 2_500</gadget>
<output>-2_450</output>

<gadget id="calculator">10_000 + (-2_450)</gadget>
<output>7_550</output>

<result>7_550</result>