A road construction team repaired the full length (2/15) on the first day, and the first day (1/2) on the second day. At this time, there is still 1800 meters to reach the midpoint of this road. Find this How long is the road?
一个修路队，第一天修了全长的(2/15)，第二天修了第一天的(1/2)，这时还有1800米就到这条路的中点处，求这条路有多长？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/15) * (1/2)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/2) - (2/15) - (1/15)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1_800 / (3/10)</gadget>
<output>6_000</output>

<result>6_000</result>