Free GMAT Practice Question

Question 1 of 1
ID: GMAT-QR-PS-049
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Word Problem
Difficulty level: Medium

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A packing hall fills a large crate using two conveyor belts. Working alone at its constant rate, belt $X$ would fill the crate in $40$ minutes and belt $Y$ would fill it in $60$ minutes. One morning the two belts are started at the same moment; some time later belt $X$ is switched off, and belt $Y$ goes on running by itself until the crate is full. The crate takes $45$ minutes to fill from the moment the belts are started. For how many minutes was belt $X$ running?

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