题目信息
A certain harbor has docking stations along its west and south docks, as shown in the figure; any two adjacent docking stations are separated by a uniform distance d. A certain boat left the west dock from docking station #2 and moved in a straight line diagonally until it reached the south dock. If the boat was at one time directly east of docking station #4 and directly north of docking station # 7, at which docking station on the south dock did the boat arrive?
A:#7
B:#8
C:#9
D:#10
E:#11
参考答案及共享解析

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已选答案:
正确答案:
B:#8
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