A large water tank in a country with a perfectly regular climate is exactly 48 feet high. During the rainy season, each day has exactly 12 hours of rainfall followed by 12 hours of evaporation. The water level in the tank increases at a uniform rate of 1 foot per hour during the 12 hours of rainfall, and it decreases at a uniform rate of half a foot per hour during the 12 hours of evaporation. If the tank is empty at the beginning of a 12 hour rainfall period, how many hours will it take for the water level in the tank to reach the top of the tank for the first time?
For example, after 12 hours the water level is 12 feet, while after 24 hours the level is 6 feet.
2006-12-04 06:35:22 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
You already answered your own question - the level increases by six feet every 24 hours.
2006-12-04 06:39:29 · answer #1 · answered by hznfrst 6 · 0⤊ 0⤋
hours
12 12
24 6
36 18
48 12
60 24
72 18
84 30
96 24
108 36
120 30
132 42
144 36
156 48
2006-12-04 14:42:03 · answer #2 · answered by bob h 3 · 0⤊ 0⤋