To build a viaduct, 60% of what has been repaired is 840 meters long. How long is this viaduct in meters?
修一座高架桥，已修的是未修的60%，已经修了840米．这座高架桥全长多少米．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">840 / (3/5)</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 + 840</gadget>
<output>2_240</output>

<result>2_240</result>