medium · GMAT Quant
Machine X can complete a task in 10 hours, and Machine Y can complete the same task in 15 hours.
If both machines work together for 4 hours and then Machine X breaks down, how many additional hours will it take Machine Y to finish the task alone?
- 9 hours
- 4 hours
- 7.5 hours
- 6 hours
- 5 hours
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