a swimmer wishes to cross a 500m wide river flowing at 5kmph.his speed with respect to water is 3kmph. if he heads in a direction making an angle theta with the flow of river find the time he takes to cross the river....

plss solve...

when the question says 3kmph wrt water .... in which direction should we take the swimmer's velocity to be 3???

I think that meants that the net velocity of the swimmer is 3 j if you consider the river to be flowing along i direction..

take hint

http://www.goiit.com/posts/list/mechanics-river-boat-problems-explain-plzzzz-58662.htm#290821