Opposite 7634

The first worker digs a canal in 3 hours. The other will dig the trench in 4 hours. They will work 1 hour opposite each other and then together. How long will it take them?

Correct answer:

t =  1.5714 h

Step-by-step explanation:

t·(1/3+1/4)= 1 - 1/3+1/4

7t = 11

t = 11/7 = 1.57142857

t = 11/7 ≈ 1.571429

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