Question

a river is 2 km wide and flows at 4km/h. a motorboat has a speed of 10 km/h in still water and heads out from one bank. a marina is directly across the river, on the opposite bank. if the motorboat heads directly toward the marina, how far downstream from the marina will be on the other bank? USING VECTOR COMPONENTS

Answer 1

BC is the resultant velocity of the motorboat.
Did you get the diagram?
Now, how much time will the motorboat take to reach the opposite bank?
Hint: Time=Distance/Speed
Consider Speed in the vertical direction.