Digging

The first worker would dig a trench in 6 hours. For the second, the same work would take 4 hours. How long did it take for the trench to be dug if they worked together?

Correct result:

t =  2.4 h

Solution:

t•(1/6+1/4)=1

5t = 12

t = 12/5 = 2.4

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