答案与解析
∵60km=6000000cm\because 60km=6000000cm∵60km=6000000cm,
∴\therefore∴比例尺=3:6000000=1:2000000=3:6000000=1:2000000=3:6000000=1:2000000.
故答案为1:20000001:20000001:2000000.
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