It will take her 2 and 2/5 of an hour because what your really can do is make this into an impropper fraction, first you add
7+5=12
Then you gotta out your answer (12) as the numerator (the top number) and five as the denominator (the bottom number). So you fraction will look like this:
12
-----
5
This fraction is known as an impropper fraction b/c it is not right. So to make it a propper fraction you will have to divide, ask your self how many times 5 goes in to 12, you answer will be 2 because 5X2=10 you then have the remaining 2 because you cannot divide anymore so you will have to use that as the denominateor so your answer will be 2 2/5
