Economic Railroads
You're the railways minister of a state. You intend to connect the four major cities in the state, located at four corners of a square with side length 100 miles. You're on tight budget. What's the shortest length, in miles, of railway tracks do you need so that all cities are connected? (Round your answer to the nearest integer)
The answer is 273.
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1 solution
PS: There's an elegant solution to this problem from physics: https://youtu.be/dAyDi1aa40E