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Working alone, Darryl can mop a warehouse in 11 hours. Elisa can mop the same warehouse in 9
hours. If they worked together how long would it take them?

Respuesta :

mhanifa

Answer:

  • ≈ 5 hours

Step-by-step explanation:

Time needed if they work together:

  • 1 / (1/11 + 1/9) =
  • 1/ (20 / 99) =
  • 99/20 ≈ 5 hours

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