On a map with a scale of 1:3000000, the distance between ports A and B is measured as 12 centimeters. A freighter sails from port A to port B at a speed of 24 kilometers per hour at 7 am and arrives at port B. how many points
在比例尺是1：3000000的地图上，量得A、B两港距离为12厘米，一艘货轮于上午7时以每小时24千米的速度从A港开向B港，到达B港的时间是多少点
<result>22</result>