Explanation:
Hey so ok, Ill explain this the best I can.
So you see the 10/2 (10/2 is the fraction just you cant type it in that way)
So 10/2 is litterally 10÷2, which is 5 just imagine that the line inbetween is a division symbol, and it goes from top to bottom, so for example 5/2 would be 5÷2... NOT 2÷5
With this said, to simplify 10/2, just divide the numerator, (Top) by the denominator (bottom) so --> 10÷2 = 5,
so Wednesday would equal 5 (and 5 is the same as 5/1 because 5÷1=5)
Do the same for Thursday 18÷3 = 6
So Thursday would equal 6 (and 6 is the same as 6/1 because 6÷1=6)
and since 6 > 5, (aka 6/1 > 5/1) She ran a longer distance per mile on Thursday, therefore she ran faster on Thursday.
Hopefully I answered your question in the right way.