Archie was walking on a small road parallel to the railway. A passenger car came head-on and passed Archie 40 seconds later. If the passenger car comes from behind Archie, it will pass Archie in 60 seconds. Ask: If Archie stands still, how long can the bus pass Archie?
阿奇在一条与铁路平行的小路上行走，有一列客车迎面开来，40秒后经过阿奇．如果这列客车从阿奇的背后开来，60秒后经过阿奇．试问：如果阿奇站着不动，客车多长时间可以经过阿奇？
<gadget id="calculator">240 / 40</gadget>
<output>6</output>

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

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">240 / 5</gadget>
<output>48</output>

<result>48</result>