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?

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asked Sep 26, 2022 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?

Mathematics
high-school

Vim asked

by Vim

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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

Mofury answered Sep 30, 2022

by Mofury

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