Free ACT Practice Question

Question 1 of 1
ID: ACT-M-43
Section: Math
Topics: Integrating Essential Skills; Time & Work
Difficulty level: Medium

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Amy and Bob decide to paint one wall of a building. Working alone, Amy takes 12 hours to paint the entire wall while Bob takes 18 hours for the same. Amy painted the wall for 4 hours and then Bob took over and completed the wall. How long did it take for them to paint the entire wall?

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