Question

Pamela can mow her lawn in 30 minutes. Kathy can do the same job in 60 minutes. How long would it take them to mow the lawn if they work together?

Answer 1

Answer: 45 minutes, because that is the half way point through the two, because one will speed up the other and one with slow down the other.

Explanation:

Answer 2

45 minutes

Explanation:

I am assuming you could add the times (60 + 30) and divide it by two because there are two girls (90 / 2) and that would give you the average time.