Question 986147
Let the speed in still water be s

The distance is 360miles each way.
The speed is (s+6) with the current and (s-6) against the current
You are told it takes 5 hours longer against the current.

You know that distance/speed = time

{{{5 = TimeAgainstCurrent - TimeWithCurrent}}}
{{{5 = (360/(s-6)) - (360/(s+6))}}}
{{{5 = (360(s+6) - 360(s-6))/((s+6)(s-6))}}}
{{{5(s^2-36) = 360s + 2160 - 360s + 2160}}}
{{{5(s^2 -36) = 4320}}}
{{{s^2 - 36 = 864}}}
{{{s^2 = 900}}}
{{{s = 30}}}

Look out Orsen. If you've ever been on a boat, 30mph is hauling .. especially in a canal. I am sure Orsen will be cautioned by the other boaters when he is zipping along the canal.