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| Answer: 10ft. It will be constant as the water getting filled and drained is exactly same. |
| First pump can fill the tank in 5 hours. So it can fill 1/5th of the tank in 1 hour. |
| Second pump can fill the tank in 7.5 hours. So it can fill 1/7.5th (= 2/15th ) of tank in 1 hour. |
| Based on the above facts, both pumps together can fill (1/5 + 2/15 = 5/15) th of tank in 1 hour. |
| So both the pumps can fill 1/3rd of the tank in 1 hour. |
| Third pump can drain the tank in 3 hours, which means it can drain 1/3rd of the tank in 1 hour. |
| Which means the water getting filled by the first and second pumps is exactly same as the water drained |
| by the third pump. So the water level in the tank will not change even after 5 hours. |
| It is a little tricky question. Isn't it? |
| Winners: Rajeswararao Ainapurapu, Raghu Ayinapurapu, Sravya Ainapurapu, Sumanth Nethi, Venkateswararao Vallurupalli. |
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