A certain section of road is traveled, the bus traveled (1/4) of this section in the first hour, and (2/5) of this section in the second hour, and there is still 140 kilometers to the end. How many kilometers is this road?
某行一段路，客车第一小时行了这段路的(1/4)，第二小时行了这段路的(2/5)，距终点还有140千米．这段路长多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">140 / (7/20)</gadget>
<output>400</output>

<result>400</result>