Answer:
c. 124 km West
Explanation:
Take east to be positive and west to be negative.
The position of Vehicle A at time t is:
A = 56t
The position of Vehicle B at time t is:
B = -68t
The position of B relative to A is:
B − A = -68t − 56t
B − A = -124t
After 1 hour, the displacement is:
B − A = -124
B − A = 124 km west
