medium · GMAT Quant
Machine R can complete an entire order in 16 hours. Machine R begins working alone, and 4 hours later Machine S joins. Working together at their constant rates, Machine R and Machine S complete the remainder of the order in 6 hours.
How many hours would it take Machine S working alone to complete the entire order?
- 12
- 14
- 16
- 18
- 20
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