As someone already said, fractions are one number over another number. But for this particular problem you would do 5 3/4 times 4 (since she jogged that many miles each day for four days) and then add that to the product of 2 3/5 times 7 (since she walked that many miles each day for seven days). You add them because it says what is the total number of miles Rachel walked and jogged last week. I then got 41 1/5 miles. So Rachel walked and jogged last week for 41 1/5 mikes.