Entry Exam Category: High School Equivalency Exams
Course: HiSET
Exam: HiSET Math Practice Test
Practice Question
Josh takes 6 hours to paint a room. Margaret can paint the same room in 4 hours. Assuming their individual rates do not change, how long will it take them to paint the room together?
Answer Choices
- A: 1.5 hours
- B: 2.4 hours
- C: 4.8 hours
- D: 5 hours
- E: 10 hours
Correct Answer: B
Rationale: Josh’s rate = 1/6 room/hour, Margaret’s rate = 1/4 room/hour. Combined rate = 1/6 + 1/4 = 2/12 + 3/12 = 5/12 room/hour. Time = 1/(5/12) = 12/5 = 2.4 hours. Options: 1.5, 4.8, 5, 10 incorrect; 2.4 correct.