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文[1]p.30有如下一道习题:如图1所示,一座小岛距离海岸线上最近的P点的距离是2km,从P点沿海岸正东12km处有一个城镇.(1)假设一个人驾驶的小船的平均速度为3km/h,步行的速度是5km/h,时间t(单位:h)表示他从小岛到城镇的时间,x(单位:km)表示此人将船停在海岸处距P点的距离.请将t表
The paper [1] p.30 has the following exercise: As shown in Figure 1, an island is 2km away from the nearest point P on the coastline, and there is a town 12km east of the coast from P. (1) Assumption The average speed of a boat driven by a person is 3km/h, the speed of walking is 5km/h, time t (unit: h) indicates the time from the island to the town, and x (unit: km) means that the person parked the boat. The distance from the point P to the coast. Please table t