Hello,
In this problem you have to multiply. Since, Marko runs 3/5 miles 3 times each week you will multiply

* 3. Whenever you have a whole number times a fraction you add the 1 as a denominator for the whole number. So now you are doing

*

multiply the numerators and denominators, 3*3=9 and 5*1=5 your final fraction will be

now change it to a mixed number and your answer will be 1

. So, Marko runs
1
each week.
Have A Good Day.