To send a document, it takes 10 minutes to send it with A fax machine alone; it takes 8 minutes to send it with B fax machine alone; if A and B send it at the same time, due to mutual interference, A and B send a total of 0.2 pages less per minute. The actual situation is that A and B send at the same time, and the data is transmitted within 5 minutes (the other party can accept two faxes at the same time), how many pages are there in this data.
要发送一份资料，单用A传真机发，需10分钟；单用B传真机发，需8分钟；若A、B同时发送，由于相互干扰，A、B每分钟共少发0.2页．实际情况是有A、B同时发送，5分钟内传完了资料(对方可同时接受两份传真)，则这份资料有多少页．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/8) - (1/5)</gadget>
<output>-3/40 = around -0.075</output>

<gadget id="calculator">(1/10) + (-3/40)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">0.2 / (1/40)</gadget>
<output>8</output>

<result>8</result>