1. If the average per week is a total of 33 hours per week, then if she did the same number of hours per family then that would be 33/2 = 16.5 hours for each family. However since she does 5 hours less for the first family then that means deduct 2.5 hours for family A and add 2.5 hours to family B:
Family A: 16.5 - 2.5 = 14 hours pw
Family B: 16.5 + 2.5 = 19 hours pw
Family A is 5 hours less than Family B, but the total average hours = 14+19 = 33 hours.
2.$5 x 14 hours = $70 per week
$7.50 x 19 hours = $142.50 per week
Total earned pw = $70 + $142.50 = $212.50
$212.50 x 9 weeks = $1912.50 earned in total, so no, she will not have enough time to reach her goal, even if she doesn't spend anything.