Posted by Tiny on .
A boat moving at 40 km/h is crossing a river in which the current is flowing at 10 km/h. In what direction should the boat head if it is to reach a point on the other side of the river directly opposite its starting point?

Physics 
bobpursley,
the upstream component is vboat*sinTheta
sinTheta=vstream/vboat=.25
theta=....