A pipe can fill a tank in 15 hours. another pipe can empty the full tank in 20 hours. If both pipes are opened simultaneously, then what is the time taken to fill the tank?
Explanation
According to the formula, if pipe A can comletely fill a tank in x hours and pipe B can empty the same tank in y hours, then the time taken to fill the tank when both the pipes are opened simultaneously is hours.
so,
The tank will be filled in 60 hours when both the pipes are opened simultaneously.
Hence option A is correct
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