Math 5th Grade Help?

Question

Irene had 30 minutes to do a three-problem quiz. She spent 9 3/4 minutes on question A and 3 1/2 minutes on question B. How much time did she have left for question C?

Answer 1

9.75 on A

3.5 on B

sums to 13.25 on A and B

30-13.25 = 16.75 or 16 3/4 minutes left for problem C

16 minutes and 45 seconds left for C