Question 1107789
Same distance each way.
If b is for the boat speed when no current, then
upstream distance {{{(b-6)(1/2)}}}
downstream, same distance {{{(b+6)(1/4)}}}


{{{(b-6)/2=(b+6)/4}}}

{{{2(b-6)=b+6}}}

{{{2b-12=b+6}}}

{{{b=6+12}}}

{{{b=18}}}-----------------------------speed of boat without a current