After building a road, the ratio of A and B to repair the road is 7:4. If A takes 40 days to repair alone, and B repairs 480 meters every day, how long is this road?
修一条路，修完后甲乙修路的比是7：4，如果甲独自修要40天，乙每天修480米，这条路有多长？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">480 / (4/7)</gadget>
<output>840</output>

<gadget id="calculator">840 * 40</gadget>
<output>33_600</output>

<result>33_600</result>