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The size of a country on a map with scale of 1:50000 is reflected as 2730.8cm^2, and the coastline is reflected as 386cm. The size of the country when drawn on another map with different scale, is 10923.2cm^2. Find the length of coastline reflected on the second map.

I don't know how to do this question. But i know that the real size of the country is 6.827x10^12 cm^2, and the coastline is 1930000000cm. But i don't know how to make use of this to find the scale of the second map.

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