A and B run together for a certain distance. When A runs the whole distance (1/2), B is 240 meters away from the finish line. When A runs to the finish line, B has just run the whole distance (4/5). Always remain the same, how many meters is the total length of this section of road?
甲乙两人同跑一段路，当甲跑了全程的(1/2)时，乙离终点有240米，当甲跑到终点时，乙刚跑了全程的(4/5)，两人速度始终保持不变，这段路全长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<result>400</result>