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A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x ) 
Correct Answer Is : Xy/y-x A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ? Correct Answer Is : 18 minutes Water is flowing at the rate of 3 km/hr through a circular pipe of 20 cm internal
diameter into a circular cistern of diameter 10m and depth 2m. In how much time will
the cistern be filled ? Correct Answer Is : 1 hour 40 minutes
An empty pool being filled with water at a constant rate takes 8 hours to fill 3/5 th
of its capacity. How much more time will it take to finish filling the pool ? Correct Answer Is : 5 hours 20 minutes
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 A water tank can be filled by a tap in 10 minutes and another tap can be filled it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tank to be full? Correct Answer Is : 45 minutes
Two pipes can fill a cistern in 6 mins and 7 minutes respectively. Both the pipe are opened alternately for 1 minute each. In what time will they fill the cistern? Correct Answer Is : 45/7 minutes Two pipes A and B can fill a tank with water in 30 minutes and 45 minutes respectively. The water pipe C can empty the tank in 36 minutes. First A and B are opened. After 12 minutes C is opened. Total time (in minutes) in which the tank will be filled up is : Correct Answer Is : 24 Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ? Correct Answer Is : 4 2/3