If a road is built 2,400 meters per day, it can be completed in 4 days; if it is 1,200 meters per day, how many days can it be completed?
一条路，如果每天修2400米，4天可以修完；如果每天修1200米，几天可以修完？
<gadget id="calculator">4 / 1_200</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">2_400 * (1/300)</gadget>
<output>8</output>

<result>8</result>