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A pipe can fill a tank in x hours and another...

This question belongs to Arithmetic Ability Pipes And Cistern
Pipes and Cistern
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A pipe can fill a tank in x hours and another can empty it in y hours. In how many hours they together fill it in ( y > x) ?

Answer & Solution
Correct Answer: Option D
Pipes and Cistern mcq solution image
Time will be taken by both of them to fill the tank
$${\text{ = }}\frac{{xy}}{{y - x}}$$
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