Free SAT Practice Question

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ID: SAT-MATH-PSDA-016
Section: SAT Math - Problem Solving & Data Analysis (PS&DA)
Topic: Ratios, rates, proportional relationships, and units
Difficulty level: Medium

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Machine X, working alone at its constant rate, produces 600 parts in 3 hours. Machine Y, working alone at its constant rate, produces 600 same parts in 2 hours. Machine Z, working alone at its constant rate, produces 600 same parts in 6 hours. To produce 600 same parts, Machine X and Y worked together for 1 hour, and then Machine Z worked alone. For how many hours would Machine Z run to produce the remaining parts?

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