Question 330751
Let b = speed of boat in still water

Let r = speed of current

We use D = rt.

Upstream:

rate = b + r

time = 4

distance = 352

Downstream:

rate = b - r

time = 2

distance = 352

From this information we make two equations in two unknowns.

I will set up the equations and you can finish.

4(b + r) = 352...Equation A
2(b - r) = 352...Equation B

This is a good start for you.  I'm sure you can finish now.