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Thanks for your help, it made me realise where I was messing up. After some changing around of the equation, it made more sense to me. 

Basically, I had to change it to ( (18.1 mg/hour^-1) /2 ) / 0.00177 mg/ml = This will get me the answer per hour (5112 ml/hour) as both of the mg get cancelled out in the equation.

Then I have to do (5112 ml/hour) / 60 = to get my answer in minutes. 

Obviously would be easier to convert 9.05 to mg/minutes but then I would not be able to keep track of the 18.1 and 9.05 mg amounts. 

Thanks for your help nonetheless. It really brought clarity to me and helped me figure out where I was going wrong. (i.e. My answer was to be compared to 125ml/min, not have that number in the equation).

@SnowWolfxX it's probably not a good idea to flirt with another member on here. Who knows if you will be violating the T's & C's if another person finds it abusive or not. I am not saying if the other person will be, just to remind you to be on your toes about it. 

Converting both answers to fractions. 

75% = 0.75 (75/100)

4/20 = 2/10 same as saying 20% (20% is 20/100)

or = 0.2

As you can see above, 75% is the bigger answer. 

It is 18.1mg because that is the amount for 2 hours. I divide it by 2, to get it for 1 hour. The answer to that is 9.05

I would do replies, but I have no idea how to do that on this site. 

The answer has not been included in the question.