GRE Work-Rate Practice Test 2

“Workers X and Y together take 9 days to complete a construction job working at their normal constant rates. If Worker X works at double his normal rate while Worker Y works at his normal rate, they complete the job in 6 days. — Compare Quantity A: The number of days it takes Worker X to complete the job working alone at his normal rate vs. Quantity B: ...”

“A two-person engineering team completes a task in 20 days working together. If both team members increase their individual rates of output by 25%, how many days will the task take them to...”

“Two water inlet pipes, Pipe A and Pipe B, can individually fill an empty cistern in 8 hours and 12 hours respectively. A drainage pipe, Pipe C, can empty the full cistern in 6 hours. All three pipes are opened simultaneously when the cistern is completely empty. — Compare Quantity A: The number of hours it will take to fill the cistern completely vs. Quantity B: ...”