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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?

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?
asked 70.9k views
1 vote
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?

asked
User Vim
by
7.9k points

1 Answer

5 votes

Answer:

  • ≈ 5 hours

Explanation:

Time needed if they work together:

  • 1 / (1/11 + 1/9) =
  • 1/ (20 / 99) =
  • 99/20 ≈ 5 hours
answered
User Mofury
by
8.0k points
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