From a place 400m north of X , a student walks eastwards to a place Y which is 800m from X. What is the bearing of X from Y?

240

Explanation:

We know that Y is 800m from X, and located 400m north of X.

That means the cosine of the bearing of Y from X is 400m/800m = 1/2

We should remember (or use a calculator with arccos) that the angle for which the cosine is 1/2 is 60deg.

The bearing of Y from X is 060.

To get the bearing of X from Y, we just need to add or subtract 180 and we arrive at the answer - 240

truck y has a greater velocity than truck x.