There are 10 taxis in a parking lot. After the first taxi departs, a taxi leaves every 4 minutes. Two minutes after the first taxi leaves, another taxi enters the venue. After that, there will be a taxi back every 6 minutes. After the original 10 taxis, the returning taxi leaves one every 4 minutes. Ask: After the first taxi leaves, how long does it take before there are no more taxis in the parking lot?
某停车场有10辆出租汽车，第一辆出租汽车出发后，每隔4分钟，有一辆出租汽车开出．在第一辆出租汽车开出2分钟后，有一辆出租汽车进场．以后每隔6分钟有一辆出租汽车回场．回场的出租汽车，在原有的10辆出租汽车之后又依次每隔4分钟开出一辆，问：从第一辆出租汽车开出后，经过多少时间，停车场就没有出租汽车了？
<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<result>108</result>