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## Homework Statement

A boat that can travel at 4.0km/h in still water crosses a river with a current of 2.0 km/h. At what angle must the boat be pointed upstream (that is, relative to its actual path) to go straight across the river?

## Homework Equations

No equations were given but it seems like a simple trig problem, just can't get the right answer

## The Attempt at a Solution

My first attempt i used inverse tan theta (4/2) and got an angle of 63

My second attempt i used inverse cos theta (2/4) and got an angle of 60

the actual answer is 30. Either there is a very big step i'm missing or i've drawn something horribly wrong.