The slow train and the fast train are traveling towards each other from AB at the same time. When they meet on the way, the distance from the midpoint is the whole distance (1/10), and then continue to drive forward. When the slow train reaches the midpoint, the express train is 60 kilometers away from the midpoint. How many kilometers is the distance between AB and AB?
慢车和快车同时从AB两地相向而行，在途中相遇时，与中点的距离是全程的(1/10)，然后继续向前开，当慢车到达中点时，快车距中点60千米，AB两地相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 2</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">(4/5) / 2</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) / (2/5)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(1/2) * (3/2)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 / (1/4)</gadget>
<output>240</output>

<result>240</result>