A transportation team was ordered to send some supplies from the station to a distant place. Each transport vehicle can travel up to 180 kilometers with full fuel, and there is no gas station on the way. Since one transport vehicle could not complete the task, the team leader decided to send two vehicles to carry out the task, one of which was responsible for transporting supplies, and the other supplied fuel on the way and returned to the station safely. Then, the farthest the materials can be transported is how many kilometers away from the station.
一支运输小分队奉命把一些物资从驻地送到很远的地方．每辆运输车装满油最多能行180千米，且途中没有加油站．由于一辆运输车无法完成任务，队长决定派两辆车执行任务，其中一辆运输车负责运送物资，另一辆则在途中供给油料后安全返回驻地．那么，最远可以把物资运到距离驻地多少千米远的地方．
<gadget id="calculator">180 + 60</gadget>
<output>240</output>

<result>240</result>