Answer: His evening walks are 30 minutes each day.
Explanation:
Okay so first you want to convert 5 1/4 hours to minutes which is 315 minutes.
Then you multiply 15 minutes x 7 days = 105 minutes.
This means that 105 min / 315 min, is spent walking in the morning.
Next, you subtract 315 from 105 which is 210.
Now you divide 210 by 7, which is 30.
Meaning that each day he spends 15 minutes walking in the morning and 30 minutes walking in the evening. :)