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GRE Test Prep : Discrete Quantitative Comparison

Formats Quiz Review
Multiple choice

A gas cylinder has two vents, V1 and V2, for discharge. The cylinder empties in 7  minutes when only vent V1 is open. The cylinder empties in 4  minutes when both vent V1 and vent V2 are open. About how many minutes will the cylinder take to empty if only vent V2 is open?



  cannot be determined



  Half-n-half Clue

Question 1.

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