It takes 5 hours for an express train to go from place A to place B, and it takes 1/5 more time for a slow train to travel from place B to place A than for the express train. After two hours, the slow train will stop Going forward, the express train continues to drive for 40 kilometers and just meets the slow train, then how many kilometers are the distance between A and B?
一列快车从甲地开往乙地需要5小时，一列慢车从乙地开往甲地所需时间比快车多(1/5)，两车同时从甲乙两地相对开出2小时后，慢车停止前进，快车继续行驶40千米后恰与慢车相遇，则甲乙两地相距多少千米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">5 * (6/5)</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">(11/30) * 2</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">1 - (11/15)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">40 / (4/15)</gadget>
<output>150</output>

<result>150</result>