<PRE><B>Question 175949</B>
Distance= Rate * Time
The distance going both directions is the same.
Let c be the speed of the current
{{{DistanceUpstream = (8 - c)*5}}} = {{{40 - 5c}}}
{{{DistanceDownStream = (8 + c)*3}}} = {{{24 + 3c}}}
So
{{{40-5c = 24 + 3c}}}
{{{16 = 8c}}}
{{{2 = c}}}
The current is 2 kph

So how far did the boat travel each way?
(8-2)* 5 = 30k
(8+2)* 3 = 30K</PRE>