Visualization tip: Consider the possible nets of the rectangular prism that makes up the room, and find what the shortest path on one of them would look like.
Another way of thinking about the visualization is to make a model of the surface that can fold up to form it. The shortest path (which will be a diagonal if not a straight line) on any of those is the answer.
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I'm pretty sure this is the correct answer too.
Visualization tip: Consider the possible nets of the rectangular prism that makes up the room, and find what the shortest path on one of them would look like.
Its the best I've found.
Another way of thinking about the visualization is to make a model of the surface that can fold up to form it. The shortest path (which will be a diagonal if not a straight line) on any of those is the answer.