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Like Eldon "arithmetic" re read my post.

On the profile, there should have been chainages and elevations. Perhaps this is a test on how well you can read a drawing. It would be a matter of arithmetic to find out distances in both the horizontal and vertical directions. Then using the steel rule to measure the paper distances, you can then work out the horizontal and vertical scales. Normally they would be conventional scales, but the interviewer could be being tricky! Good luck in searching for any other method.

Nope no command for that, you would need to go i nto the block editor and make everything visible which you can do with the command -bvstate this will let you create a new visibilty state and choose to show all objects within that state. But it isn't available from outside the block editor. Someone over at the lisp forum may know of a way to achieve this.

Look at what is written on the print out. Is there a title block? If not, then you have not got the complete print out. Have you got a scale ruler? In the last resort, you could try guessing the scale by measuring features. Post a copy of the information that you have, and let us guess with you.

Metric makes it easy 1000/scale = multiply factor, so 1:50, dist/20 = true distance, but as mentioned, if FIT used to print even more likely to be wrong.