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One custodian can vacuum the library of a school in 3 0 min. It takes a different custodian 1 h r to vacuum the library.

One custodian can vacuum the library of a school in

30

min. It takes a different custodian

1 h r

to vacuum the library. How long would it take them if they worked together?

The two custodians can vacuum the library in min by working together.

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