On Children's Day, the students took a coach to visit Erlong Mountain. The speed of the car up the mountain is 27 kilometers per hour, and the speed on the flat road is three times that of the uphill speed. The car travels on the flat road and the uphill road for 3 hours each, and finally reaches the top of the mountain. How long is the whole journey?
六一儿童节，学生们乘坐一辆旅游车去二龙山游玩．汽车上山的速度为每小时27千米，平路上的速度是上山速度的3倍，汽车在平面路段和上山路段各行了3小时，最后到达了山顶．问整个路程有多长？
<gadget id="calculator">81 + 248</gadget>
<output>329</output>

<result>329</result>