On a map with a scale of 1:5000000, the distance between A and B is 3 cm. If a car drives from A to B at 7:00 am at a speed of 50 kilometers per hour, when will it arrive at B? land?
在比例尺是1：5000000的地图上量得A、B两地之间的距离是3cm，一辆汽车上午7时以每小时50千米的速度从A地开往乙地，什么时间可以到达B地？
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