Sanford can assemble a computer in 60 minutes. Colleen can assemble a computer in 40 minutes. If they work together, how many minutes does it take them to assemble a computer?

1 Answer
David Britz
Apr 30, 2016

24 minutes, you can find this by adding the rates

Explanation:

Sanford can assemble 1/60 computer per hour
Colleen can assemble 1/40 computer per hour

Combined rate 1/40+1/60=6/240+4/240=10/240

So combined they build 10/240 computers per hour, or 240/10=24 hours per computer

Related questions
Impact of this question
4934 views around the world
You can reuse this answer
Creative Commons License