Both the express train and the slow train travel from A to B, and the two trains start at the same time. When the express train has traveled (1/2) the full distance, the slow train has traveled 40 kilometers. 1/5), how many kilometers is the whole journey between places A and B?
快车和慢车都从甲地到乙地，两车同时出发，当快车行了全程的(1/2)时，慢车行了40千米，当快车到达乙地时，慢车还差全程的(1/5)，甲乙两地全程是多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / (4/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">40 * (5/2)</gadget>
<output>100</output>

<result>100</result>