Posted by **Tarkan** on Monday, March 12, 2012 at 10:45pm.

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?

- Vectors -
**Steve**, Tuesday, March 13, 2012 at 4:42am
You don't really even need vectors for this. It takes 2/10 hours to cross the river. In that time, the boat drifts downstream 2/10*4 = 4/5 km.

Now, if you want to find the heading needed to get straight across the river, then you need some vectors.

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