Team A and Team B build a road with a length of 125 kilometers. Team A repairs 4 kilometers every day. Team B joins in after 2 days and completes the task together for 13 days. How many kilometers does Team B repair every day?
甲乙两队修一条长125千米的路，甲队每天修4千米，2天后乙队加入又共同修13天完成任务，乙队每天修多少千米？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">125 - 8</gadget>
<output>117</output>

<gadget id="calculator">117 / 13</gadget>
<output>9</output>

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<result>5</result>