Answer
Answer C
Work Step by Step
As we can see, the depth of the water in the tank decreases by 1 ft every 2 hours. In the first 2 hours the amount of water decreased from 12ft to 11ft, the next 2 hours 11ft - 10ft, and so on. If the amount of water in the lake kept leaking at a rate of $1ft / 2h$, then after 10 hours, the depth of the household would be 7ft.
The answer is C.
