Problem reads: A truck is traveling due north at 30km/hr towards a crossroads. On a perpendicular road a police car is traveling west toward the intersection at 40km/hr. both vehicles will reach the crossroads in exactly one hour. find the vector representing the displacement of the truck with respect to the police car.
What I know: (maybe)
The vector is part of an isosceles triangle with 90° where the vectors meet and 45° where the vectors start.
What I don't know: