1. The problem statement, all variables and given/known data Each one of the ﬁve workers W1, W2, W3, W4 and W5 can do a certain job. W1, W2, W3 together can do it in 7.5 hours. W1, W3, W5 together can do it in 5 hours. W1, W3, W4 together can do it in 6 hours. W2, W4, W5 together can do it in 5 hours. Find the time in which all ﬁve together can complete the job. 2. Relevant equations - 3. The attempt at a solution Can I convert these conditions into equations like this - 1/w1 + 1/w2 + 1/w3 = 1/7.5 ?? Please help !