A man walks at 5 km/h for 6hr and at 4km/h for 12hr. His average speed is

Question

A man walks at 5 km/h for 6hr and at 4km/h for 12hr. His average speed is

A. 9 ½ km/h

B. 8 km/h

C. 4 1/3 km/h

D. 7 2/3 km/h

Answer: C

Solution:

Avg speed = total distance/total time

= 5*6 + 4*12 / 18

= 4 1/3 km/h