It usually refers to how fast one quantity changes with respect to another, frequently time.
In our problem, we are given the information on two snowfall rates, one during the winter of 2012–2013 in Buffalo, New York, and the other in Oswego, New York. Buffalo received 22 inches of snow in 12 hours. It means the rate of change or ratio of snowfall in time is:
If you are overdrafted -275.20 and then charged an $18.00 over draft fee your account to start is -$293.20. Then you deposit 325.00 so 325.00 - 293.20 = 31.80 left in the account.