Build a canal, and after 5 days of repairing, it exceeds the midpoint by 240 meters. The rest can be completed in 3 days at the original speed. How long is this road?
修一条水渠，修了5天以后超过中点240米．剩下的按原来的速度继续修3天可以完成，这条公路长多少米？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(5/8) - (1/2)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">240 / (1/8)</gadget>
<output>1_920</output>

<result>1_920</result>