3 years ago

Working alone, Darryl can mop a warehouse in 11 hours. Elisa can mop the same warehouse in 9

Mathematics

1 answer:

Harrizon [31]3 years ago

3 0

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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