To build a road with a length of 5000 meters, 750 meters were built in 3 hours. According to this calculation, how many hours will it take to complete the construction of this road? (use analogy as solution)
修一条长5000米的公路，3小时修了750米．照这样计算，修完这条公路，一共要用多少小时？(用比作解)
<gadget id="calculator">3 * 5_000</gadget>
<output>15_000</output>

<gadget id="calculator">15_000 / 750</gadget>
<output>20</output>

<result>20</result>