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A pipe can fill a cistern in 9 hours. Due to leak in its bottom, the cistern fills up in 10 hours. If cistern is full, in how much time will it be emptied by the leak?
Correct Answer Is : 90 hours Pipe A and B can fill a tank in 10 hours and 8 hours respectively. After certain
time, pipe A was closed. It took a total of 6 hours to fill the tank completely. For
how many hours did pipe A work? Correct Answer Is : 2 1/2 hours