Question

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?

Answer 1

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