Workers 2

Worker dug the trench for 7 hours, another worker for 10 hours. They recruited to work even one worker more. Digging should be done for 2 hours. For how long would dig third worker alone?

Correct answer:

x =  3.8889 h

Step-by-step explanation:

x/2-x/7-x/10 = 1

18x = 70

x = 35/9 ≈ 3.888889

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