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 answer:

t =  2.4 h

Step-by-step explanation:

t (61+41)=1  t (1/6+1/4)=1  5t=12  t=512=2.4  t=512=2.4=2.4 h



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