Working alone, Darryl can mop a warehouse in 11 hours. Elisa can mop the same warehouse in 9
1 answer:
Answer:
Step-by-step explanation:
<u>Time needed if they work together:</u>
- 1 / (1/11 + 1/9) =
- 1/ (20 / 99) =
- 99/20 ≈ 5 hours
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