## anonymous one year ago MEDAL 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?

1. anonymous

answer choices 240 80 48 40

2. anonymous

frankie can do it in 120 minutes, tisha can do it in 80 minutes, together the can do it in $$t$$ minutes $\frac{ 1 }{ 120 }+\frac{ 1 }{ 80 }=\frac{ 1 }{ t }$ multiply by the lcd of 240t $2t+3t=240$

3. anonymous

80

4. anonymous

48 sorry