B if not please comment back .
<span>The answer to this question depends upon Newton's third law of motion. For every action, there's an equal and opposite reaction. Because of this law, during the collision between two unequal masses, the impulse that each mass receives will be of equal magnitude and and opposite sign.</span>
Average speed = (total distance) / (total time)
Total distance = 59 km + 74 km = 133 km
Total time = 3 hrs + 5 hrs = 8 hrs
Average speed = (133 km) / (8 hrs) = 16.625 km/hr
