Question 1012033
If the current is constant, you find the speed of the barge in still water by taking the average of the two speeds upstream and downstream. This is because if you take the sum of speed plus current and speed minus current, you're left with the speed. So, {{{(8+3.8)/2=5.9}}}


Then you can substitute this into the system and solve.
{{{5.9+current=8}}}
{{{5.9-current=3.8}}}
current=2.1 mph.