i need help solving theses math problem !!!?

Question

PROBLEM1: Sam wants to run 2 1/2 miles for his workout. If he has already completed 9/10 of a mile, how much farther does he have to run?

PROBLEM:2 Kathryn is a college student who works part time at a coffee house. She worked 5 5/6 hours on Monday, 3 3/4 hours on Wednesday, and 8 hours on Thursday. How many hours did she work
altogether?

please show how you got the answer .

Answer 1

Easy.

Solution to Problem 1: Subtract 2 1/2 by 9/10. 2 1/2= 2x2+1 divided by 2= 5/2=25/10. You have common denominator so keep it after you've subtracted the numerators. 25/10-9/10= 16/10(miles) or

1 3/5 miles.

Solution to Problem 2: Add the hours all up(altogether is the key word). So 5 5/6= 31/6=62/12.

3 3/4=15/4=45/12. Add the 2 fractions and you get 107/12. Simplify. You get 8 11/12. Then, just add the whole numbers. 8+8=16+11/12=16 11/12 hours(Your answer). or 16 hours and 55 min.

Answer 2

Problem 1: 1 and 3/5

Problem 2: 17 hours 35 minutes

Answer 3

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