3.

Nicky exercises each horse for 30 minutes. She exercised 6 horses today.

How many minutes?_

hours?

3

Because each hours is an hour and 60 minutes are in one hours and 60/2 is 30

Answer: 3 hours

Step-by-step explanation:

Theres 60 minutes in an hour. So, 2 horses can be done in one hour. Which means the other 4 horses can be done within an additional two hours.