First you have to find how many times she will have to walk 3/5 miles to get to 2 miles [2 divided by 3/5. Another way is to divide 2 by 6/10 (.6) ] This is 3.3333333..... Then you will have to multiply this by 24 to find how many minutes it took her to walk the 2 miles.
It took her 80 minutes. Another way to say this is 1 hour an twenty minutes.
you can also write it as a fraction, 1 2/6 hour or 1 1/3 hour.