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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beat a hasty retreat
to retreat or withdraw very quickly
The soldiers beat a hasty retreat when the guerrillas attacked them.
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