Question

The relative velocity of H wrt G is given by​

Answer 1

ANSWER: this velocity is computed according to the person as an observer inside the object.

Answer 2

Relative velocity of an object with respect to another

Let the two objects are A and B

Definition :the relative velocity of an object A

With respect to another object b is the velocity that object A would appear B moving along a straight line when their relative velocity zero and non-zero.