Question 1043744
x=number of hours since time 0
When x=2, 100 liters have flowed in.
The easiest way to do this is to note that water can be bailed 10 liters per hour more than it flows in.  There are 100 liters in the basement, 100/10=10 hours it will take to bail it all out.  During that time 100 liters flowed in for the first two hours and 500 more for the next 10 hours, or 600 liters total.
For the 10 hours of bailing, at 60 liters/hour, that is 600 liters.