A boat travels down stream, then travels up stream

[Kingyou123]

Homework Statement

What is the time needed to complete a trip if v = V.

Homework Equations

t=(2Dv)/v^2-V^2)

The Attempt at a Solution

I drew a diagram and tried plugging values in.

 

[billy_joule]

What is the time needed to complete a trip if v = V.

Think about what this means.

Will a boat travel upstream if it's velocity is equal to that of the downstream water?
Have you ever walked on a treadmill? What speed must you walk at to stay on the treadmill?

The Attempt at a Solution

I drew a diagram and tried plugging values in.

And what was the result?

 

[paisiello2]

Terrible diagram but why don't you attempt am answer?

 

[phinds]

I drew a diagram and tried plugging values in.

That's not a helpful description of your calculations. Be more specific

 

[Kingyou123]

Think about what this means.

Will a boat travel upstream if it's velocity is equal to that of the downstream water?
Have you ever walked on a treadmill? What speed must you walk at to stay on the treadmill?
And what was the result?

So the velocity of the boat has to be greater than the velocity of the current when rowing back. I made a force diagram with vectors. I always have problems with problems that don't give numbers... so would v<V?