Hey everyone, i have a question here on 2D problems that i'm pretty much stuck on A ferry boat has a speed of 9.0km/h in calm water. Its pilot takes it on a heading due north across a river that has a current of 4.0km/h west. It takes 15 minutes to cross the river. a) how far downstream does the ferry land? (the answer is 1.0km) for a, (i've drawn a diagram) i've found the width of the river which is 2.3km and i've also found the velocity of the boat relative to the shore which is 9.8 km/h, 24 degrees W of N. from there, i'm stuck. plz help! TY!