physics
posted by cindy .
A boat moving at 15 km/h relative to water is crossing a river 1.5 km wide. The river flows at 5.0 km/h
a) if the boat heads directly for the opposite shore, how long will the trip take?
b)Where will the boat arrive on the opposite shore?
c)If the boat is to reach a point directly across from the starting point , in which direction should the boat head?
d)How long will the crossing take in case c)?

JohnX.
Please use my prior response as a starting point. We are not going to do the work for you.
The first line of the previous response tells you the answer to a.
The secondline tells you the answer to b.
The last part tells you how to get c and d.
I will be happy to critique your work or thinking