Free SAT Practice Questions

Question 1 of 1
ID: SAT-PSDA-7
Section: Math - Problem Solving & Data Analysis
Topic: Time and Work
Difficulty level: Challenging

(Practice Mode: Single selected Question » Back to Overview)

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? (Calculator is allowed)

A$\frac{1}{3}$
B$\frac{1}{2}$
C$1$
D$2$