7. Cathy spent of an hour on her math homework,

of an hour on her science homework, and of an

hour on her reading homework. How long did

Cathy work on homework?

3 hours or 180 minutes

Step-by-step explanation:

1 hour for math

1 hour for science

1 hour for reading

Equals 3 hours or 180 minutes

Answer:1 hour+1 hour+1 hour=3 hours

Step-by-step explanation:This is because she worked 1 hour on each homework. and there is 3 homework. Think is this way 3 groups of 1

1 1 1

3 homework and 1 hour each.