The difference between the fractions 5 minutes of an hour and 20 seconds of an hour is:

Correct option is A

Given:

difference 5 minutes of an hour and 20 seconds  of an hour.

Solution:

5 minutes =5/60 hour

20 seconds = 20/3600 =1/180 hour

difference = 5/60 -1/180

                  =15/180 -1/180

                  =14/180 =0.7/9