quantitative aptitude test 115

Test # 115
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1. Three taps are connected to a water tank. First and second taps till it up in 'x' minutes and 'y' minutes respectively, when they arc opened separately. The third tap empties the full tank in 'z' minutes. If all are opened simultaneously, what is the condition required on 'x', 'y' and Y to ensure that the tank will actually fill up?

Quantitative Aptitude
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in return for (someone or something)
as part of an exchange, as a way of paying someone back
In return for cleaning his carpets my friend helped me clean up our basement.
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