A runner travels south along a straight path for 5.5 h with an average velocity of 1.75 km/h, then travels south for 7.5 h with an average velocity of 0.90 km/h. What is the hiker’s displacement for the total trip? *

A) 9.6 km to the south

B) 6.8 km to the south

C) 16.4 km to the south

D) 2.8 km to the south