Free GMAT Practice Question

Question 1 of 1
ID: GMAT-QR-PS-065
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Word Problem
Difficulty level: Medium

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A bindery owns $8$ identical stitching machines, each working at the same constant rate. Running all $8$ of them together, the bindery completes a certain order in $15$ hours. One morning all $8$ machines start together and run for $6$ hours, after which $2$ of them are switched off; the remaining $6$ machines then finish the order. For how many more hours do those $6$ machines run?

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