Answer:
To get this, we will need to add 1/4 and 1/3 to get the amount that was watched between the two. To do this, we need to get the common denominator, which is 12. Once we multiply the sides to get the common denominator, we will get 3/12 and 4/12. we can add these to be 7/12, and that means that Robert had watched 5/12 of the movie at night.