I attached my MathCAD 9.0.0.0 file.
The correct answer for the 1st part is...
If 
, I get the wrong answer...
If I remove the "min" units 
, I get the right answer...
...I don't know why it's doing that, but worst case, I can live with that. The 2nd part answer should be...
However, it won't calculate the answer...
There might be a problem with the variable Ct because before there was a box around just that variable in the equation. Now the box is around the entire equation.
Unfortunately, you've hit the perennial problem of trying to use units in an equation that has already had the units precalculated to get the desired units (eg, hour to min) and/or removed from the equations.
The power of 0.125 is a strong indicator that the terms inside the parentheses are unitless numbers. Indeed, the symbolic failure flags up a unit incompatibility error (note that rhs divisor adds 1/min to a number).
Removing units gives the following:
Stuart
(I haven't got MP9, so didn't post the amended worksheet)
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