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Since it is called a distance time graph I don't think it is too wild a guess to suggest that they might be "distance" and "time"!
Carpentry
because of altitude
You can use the distance formula: http://www.teacherschoice.com.au/maths_library/analytical%20geometry/alg_15.htm (this might help).
There is no accepted unit called the "mini second". You might be confusing nano- or milli- for the prefix.