Worker trench time

Worker A will dig a trench in 12 days. Worker B will dig a trench in 18 days. How many days will it take them together?

Final Answer:

t =  7.2 d

Step-by-step explanation:


t·(1/12+1/18)=1

5t = 36


t = 36/5 = 7.2

t = 36/5 = 7.2

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