Question 607953
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Hi, Thx for the TY, note "days"
John can complete a piece of work in 3 days. Jojce in 9 days and James 4.5days.
Let x represent the time to do it together
Question states*** Per day KEY
 1/3 + 1/9 + 1/4.5 = 1/x
 9(4.5)x + 3(4.5)x + 27x = 9򉁬.5
                  81x = 9򉁬.5
                    x = 9򉁬.5/81 = 4.5/3 = 1.5 {{{highlight(days)}}}