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One tractor driver would mow the field in 15 hours. Another tractor driver would do the same job in 12 hours. How long will it take them to do the work together if the latter starts plowing two hours later than the former?

Correct answer:

t =  7.7778 h

Step-by-step explanation:

t·1/15 + (t-2)·1/12=1

9t = 70

t = 70/9 = 7.77777778

t = 70/9 ≈ 7.777778

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