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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!

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