Xiao Ming takes the No. 61 trolleybus from the train station and gets off at Lequn Street Station. On the bus, he finds that there is a No. 61 tram coming towards him every 3 minutes. From the starting point of Lequn Street Station, a car leaves every few minutes.
小明从火车站乘61路无轨电车到乐群街站下车，在车上他发现每隔3分钟就有一辆61路电车迎面开来，如果所有61路电车速度都相等，那么61路电车从乐群街站起点站每隔多少分钟开出一辆车．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<result>6</result>