Mathematics, 29.01.2020 02:53, alexmodersks3055

Bob and ted are in the plumbing business. bob can do the plumbing hook-up for a new house in 4 hours; ted does the same job in 6 hours. if they work together, how long will they take to hook up the plumbing in one house? 2.1 hours 2.4 hours 5 hours

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Bob and ted are in the plumbing business. bob can do the plumbing hook-up for a new house in 4 hours...