On a sightseeing trip in Europe, Sam is riding a tour bus moving north along a straight section of road at 8.0 m/s. While Sam looks out at a forest, he hears some passengers on the other side of the bus say they can see a famous castle from their side. Same hurries straight across the bus, going east at 4.0 m/s relative to the bus, so that he can also see the castle.
Determine Sam Velocity relative to the castle?