话说小灵通参观“三角形庄园”后，驾驶着“时间号”飞船回家．途中他沿着环宇高速公路上空飞行，一路上看见环球旅游公司的公交车往返奔驰，而且发现每隔4分钟便有一辆公交车和他迎面而过，每隔5分钟他便超越一辆公交车．根据这两个简单的条件，小灵通极想知道旅游公司究竟是 After saying that PHS visits “Triangle Manor”, he drove home with the “Time” spacecraft. On the way, he flew along the Huanyu Expressway. He saw the Global Travel Company’s bus running back and forth along the way, and found that there was a bus and he was there every 4 minutes. He crossed a bus every 5 minutes. . Based on these two simple conditions, PHS would like to know exactly what the travel company is