Kristi jogged for 3/5 of an hour, swam for1/2 an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?

Answer 1

Look like you are expected to add the fractions:

3/5 + 1/2 + 3/4

so need to add the fractions

use a common denominator

12/20 + 10/20 + 15/20

can you take it from here?

Alternatively
3/5 hour is 36 minutes
1/2 hour is 30 minutes
3/4 hour is 45 minutes

total is ? minutes

Answer 2

1 hour 51 minutes

Answer 3

Agreed