car drives from A to B. If it travels 54 kilometers per hour and arrives 1 hour earlier than the original time; if it travels 45 kilometers per hour and arrives 1 hour later than the original time, then from A to B How far is the distance in kilometers?
一辆汽车从甲地开往乙地，如果每小时行54千米，比原定时间提前1小时到达；如果每小时行45千米，比原定时间迟1小时到达，那么甲地到乙地的距离是多少千米？
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">1 / 54</gadget>
<output>1/54 = around 0.018519</output>

<gadget id="calculator">(1/45) - (1/54)</gadget>
<output>1/270 = around 0.003704</output>

<gadget id="calculator">2 / (1/270)</gadget>
<output>540</output>

<result>540</result>