What was the hiker's average speed for the entire hike?

A.
10 km/h

B.
6.7 km/h

C.
5.7 km/h

D.
2.0 km/h

http://static.k12.com/calms_media/media/938500_939000/938700/1/50efd4111bd35bf1b572ea9348d89df730177bbe/MS2_PHY_04_18_104_marble_graph.jpg

Question

What was the hiker's average speed for the entire hike?		
  

 
 A.
10 km/h
 
 B.
6.7 km/h
 
 C.
5.7 km/h
 
 D.
2.0 km/h

http://static.k12.com/calms_media/media/938500_939000/938700/1/50efd4111bd35bf1b572ea9348d89df730177bbe/MS2_PHY_04_18_104_marble_graph.jpg

anonymous · Answer

Since you're only looking for average speed, you just add up the total distance covered (20km) and divide by the time it took (3hrs) which comes out to be 6.7 km/hr. B