medium · GMAT Quant
Working alone, Machine X fills an order in 10 hours and Machine Y in 15 hours.
If they work together for 3 hours and then Machine X breaks down, how many more hours will it take Machine Y to finish the order alone?
- 7.5 hours
- 9 hours
- 4.5 hours
- 5 hours
- 6 hours
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