SOLUTION: John can complete a task in 18 days while Peter can complete it in 12 days. How many days will it take them to complete the task if they both work on it together?

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Question 1198431: John can complete a task in 18 days while Peter can complete it in 12 days. How many days will it take them to complete the task if they both work on it together?
Answer by math_helper(2461) About Me  (Show Source):
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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:



+1+%2F+%28%281%2F18%29+%2B+%281%2F12%29%29+ = 7.2 days  (7 days, 4 hours, 48 minutes)