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Using DecoPlanner and assuming a SAC rate of 0.85 cu-ft/min and EAN 30, a dive to 110' for merely 13 minutes would exceed the capacity of your 60 cu-ft tank. This includes a 1 minute stop at 30' and another 1 minute stop at 20' (which really is not long enough since it takes at least 2 minutes for one complete cycle of your circulatory system).
Using the "Rule of Thirds", a maximum profile for a 60 cu-ft tank would be 6 minutes at 110' with a 3 minute stop at 20'.
I can't imagine why the instructor would choose to take you down with such little gas supply.
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