Question

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?

Please show work or a picture, I am so confused

Answer 1

The first thing you should know is how long it takes each one to build a box.
We have then:
Frankie = 120minutes
Tisha = 120-40 = 80minutes
Then, we take the average:
(120 + 80) / (2) = (200) / (2) = 100 minutes.
answer
It takes them to build the speaker box 100 minutes.