John's rate is 1/18 task per day

Peter's rate is 1/12 task per day



We divide 1 task by the sum of their daily rates of work to get the number of days required for both working together:



 = 7.2 days  (7 days, 4 hours, 48 minutes) 

RELATED QUESTIONS

How long will it take  workers to complete a task, given that  workers can complete the... (answered by JulietG)

Roxanne, Peter, and Cal can complete a job in three days. Roxanne can do the job in 8... (answered by josgarithmetic,MathTherapy)

If it takes 20 people to complete as task in 12 days. How many people will it take to... (answered by Edwin McCravy)

Ho long will it take 6 workers to complete a task, give that 7 workers can complete the... (answered by solver91311,Edwin McCravy,stanbon)

Suppose that 5 workers can complete a certain task in 12 days. If there are 15 workers,... (answered by ankor@dixie-net.com)

how many machines will it take to complete a task in 3 days, considering it takes 10 days  (answered by stanbon)

 Sixteen men complete a work in 24 days while 48 children can do it in 16 days. Twelve... (answered by josmiceli,josgarithmetic)

A and B together can complete a work in 12 days.
C alone can complete the same work in... (answered by ikleyn,Theo,greenestamps,math_tutor2020,Edwin McCravy,MathTherapy)

Suppose that 
6
 workers can complete a certain task in 
10
 days. If there are 
20
 (answered by josgarithmetic)