It takes 8 hours for A to travel from A to B, and 10 hours for B to travel from B to A. Now they are walking towards each other from AB and meet at a distance of 20 kilometers from the midpoint. What is the distance between AB and AB?
甲从A到B要走8小时，乙从B到A要走10小时，现两人从A-B相向而行，距中点20千米处相遇，则AB之间的距离是多少．
<gadget id="calculator">20 + 20</gadget>
<output>40</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">40 / (1/9)</gadget>
<output>360</output>

<result>360</result>