Completes 4234

The worker completes the work in 12 days; the second in 10 days. The first worker kicks himself for four days, then the second worker comes. How long will it take to dig?

Correct answer:

t =  7.6364 d

Step-by-step explanation:


t/12+(t-4)/10=1

11t = 84


t = 84/11 = 7.63636364

t = 84/11 ≈ 7.636364

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