Mathematics, 27.01.2020 23:31 krystianah

Frankie can build a speaker box in 120 minutes. tisha can build a speaker box 40 minutes faster. if they work together, how many minutes does it take them to build the speaker box?
240 minutes
80 minutes
48 minutes
40 minutes

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Frankie can build a speaker box in 120 minutes. tisha can build a speaker box 40 minutes faster. if...