How do speed settings on treadmills work?

I have a fitness test in a few weeks time, which involves using a treadmill. I hate the flipping things, but went to use one at local gym last night to get myself used to it.

 But, I have to admit, I am really confused about how the speed settings on it worked. It didn't seem to be in mph, kph or anything else that was remotely fathomable.

 Are they all the same these evil machines? Can anyone help me? (I need to run 1.5 miles/2.4 km in 13mins)

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