The engineering team overhauls a railway. Team A starts from its northern end and overhauls 23km a day. One day after team A starts working, team B starts from its southern end and overhauls 47km a day. The two teams have just finished repairing this railway after 8 days. Road, how long is this road in km?
工程队检修一条铁路，甲队从它的北端开始，每天检修23km，甲队开工1天以后，乙队从它的南端开始，每天检修47km，两队合修8天以才刚好修完这条路，这条路长多少km？
<gadget id="calculator">23 + 47</gadget>
<output>70</output>

<gadget id="calculator">70 * 8</gadget>
<output>560</output>

<gadget id="calculator">560 + 23</gadget>
<output>583</output>

<result>583</result>