Question 1193084
2 mph, Leo's speed without in a current
c, speed of the current

Upstream speed 2-c
Downstream speed 2+c

<pre>
            SPEED      TIME                       DISTANCE

DOWN         2+c       {{{ (1/4)/(2+c)}}}             {{{ 1/4}}}

UPSTR        2-c       {{{(1/4)/(2-c)}}}               {{{1/4}}}
</pre>
According to the description, {{{(1/4)/(2-c)=3(1/4)/(2+c)}}}, and the question asks for c.


Multiply left and right side members by 4;
{{{1/(2-c)=3/(2+c)}}}


{{{2+c=3(2-c)}}}


{{{2+c=6-3c}}}


{{{4c=4}}}


{{{highlight(c=1)}}}