Two engineering teams jointly dug a 690-meter-long canal, starting from one end at the same time. The first team dug 14.8 meters per day, and the second team dug 15.2 meters per day. How many days will it take to dig this canal?
两个工程队合挖一条690米长的水渠，同时各从一端开工．第一队每天挖14.8米，第二队每天挖15.2米．这条水渠要用多少天才能挖通？
<gadget id="calculator">14.8 + 15.2</gadget>
<output>30</output>

<gadget id="calculator">690 / 30</gadget>
<output>23</output>

<result>23</result>