Question

John does a job in 16 hours. joe does the same job in 22. how long if they work together?'

Answer 1

Joe's working rate = 1/16 per hour
Joe's working rate = 1/22 per hour

Let t = hours spent when working together.
Then
t = 1/(1/16 + 1/22)
= 1/(0.0625 + 0.0455)
= 9.263 hours
= 9 hours + 0.263*60 min
t = 9 hours, 16 minutes

Answer: 9 hours, 16 minutes