Well firstly we must find the amount of minutes spent watching.
Which is 3 * 60 = 180mins.
Then we find 1/6 of 180 = 30
We now know Cody has watch 30 minute of the movie.
To find what fraction this is of an hour we divide it by minutes in an hour:
30/60 which is 1/2
Therefore the answer is 1/2 of an hour