Two road construction teams work together to build a 700-meter-long road, starting from both ends at the same time. Team A repairs 14 meters per day, and Team B repairs 21 meters per day. How many days will it take to complete the repair?
两个修路队合修一条长700米的公路，同时从两端开始，甲队每天修14米，乙队每天修21米，经过几天才能修完？
<gadget id="calculator">14 + 21</gadget>
<output>35</output>

<gadget id="calculator">700 / 35</gadget>
<output>20</output>

<result>20</result>