A ship is travelling with a velocity (30i- 42j), and a trolley is being pushed relative to the ship with the velocity (-5i- 6j). A fly is crawling on the trolley with relative velocity ( -i- 1/2j - k).

Question

A ship is travelling with a velocity (30i- 42j), and a trolley is being pushed relative to the ship with the velocity (-5i- 6j). A fly is crawling on the trolley with relative velocity ( -i- 1/2j - k). 
a) calculate the velocity and the speed of the relative to the Sea. all velocities in this question are given in km/h. 
b) a bird is flying overhead with a velocity vector 22i + 10j - 6k
what is the angle between the velocity vectors of the bird and the fly?

**every letter next to a number should have an arrow on top showing it is a vector!