Two people, A and B, start from A and B at the same time, walk towards each other, and meet after 10 o'clock. If they travel 2 kilometers less each time, then they can meet after 12 o'clock. How many kilometers away are the places?
甲、乙两人分别从A、B两地同时出发，相向而行，10时后相遇，如果两人每时都少行2千米，那么，12时后才能相遇，问：A、B两地相距多少千米？
<gadget id="calculator">2 + 2</gadget>
<output>4</output>

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

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/10) - (1/12)</gadget>
<output>1/60 = around 0.016667</output>

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

<result>240</result>