Question 30924
Welder A -> 3x
Welder B -> x
Total Time -> 3 hours

The equation would be:

{{{3x+x=3}}}
{{{4x=3}}}
{{{x=3/4}}}

Welder A -> 3x
{{{3*(3/4)}}}
{{{9/4 hours}}} or 2.25hours