Maria has a total of \( \frac{3}{4} \) of an hour to complete all four parts of the math test. To find out how much time she can spend on each part, divide the total time by the number of parts:
\[ \text{Time per part} = \frac{\frac{3}{4} \text{ hour}}{4} \]
To divide \( \frac{3}{4} \) by 4, we can rewrite 4 as \( \frac{4}{1} \) and then multiply by the reciprocal of \( \frac{4}{1} \):
\[ \text{Time per part} = \frac{3}{4} \times \frac{1}{4} = \frac{3 \times 1}{4 \times 4} = \frac{3}{16} \text{ hour} \]
Now, we can convert \( \frac{3}{16} \) hour into minutes (since there are 60 minutes in an hour):
\[ \frac{3}{16} \text{ hour} \times 60 \text{ minutes/hour} = \frac{3 \times 60}{16} = \frac{180}{16} = 11.25 \text{ minutes} \]
Thus, Maria has \( 11.25 \) minutes to spend on each part of the test.