Two road repair teams, A and B, work together to build a 120 km long road. Team A repairs 3 km every day. Team A repairs for 1 day first, and then teams A and B work together to complete the task after a total of 13 days. How many kilometers does Team B repair every day?
甲、乙两个修路队共同修一条长120km的路，甲队每天修3km，甲队先修1天后，由甲、乙两队共同修，一共经过13天完成了任务．乙队每天修多少千米？
<gadget id="calculator">120 - 3</gadget>
<output>117</output>

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

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<result>6</result>