A township elementary school visited the county seat, and it was stipulated that the car departed from the county seat and arrived at the school at 7:00 am, and the students who picked up the visit set off for the county seat immediately. Because the car broke down on the way to school, it had to be stopped for repairs. The teachers and students of the school waited until 7:10, but still did not see a car to pick them up, so they walked towards the county town and encountered a repaired car on the way. Immediately got in the car and rushed to the county seat, but arrived at the county seat half an hour later than the scheduled time. If the speed of the car was 6 times the walking speed, how long did it take for the car to troubleshoot on the way?
某乡镇小学到县城参观，规定汽车从县城出发于上午7时到达学校，接参观的学生立即出发去县城．由于汽车在赴校的途中发生故障，不得不停车修理，学校师生等到7时10分，仍未见汽车来接，就步行走向县城，在行进途中遇到了已经修理好的汽车．立即上车赶赴县城，结果比预定到达县城的时间晚了半小时，如果汽车的速度是步行速度的6倍，问汽车在途中排除故障花了多少时间？
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">20 + 10 + 8</gadget>
<output>38</output>

<result>38</result>