1. If two fathoms are 12 feet deep, we know that one fathom is six feet deep. multiply 6 by 10, and you'll get 60 feet deep.
2. When answering these kinds of questions, I recommend looking at an analog clock. When you count from 10:30 to 3:30, you see that Jessica babysat for five hours. $6.50 multiplied by five is $32.50.