question_answer

A car travels \[\frac{1}{3}\] of the distance on a straight road with a velocity of 10 km/h, next one third with a velocity of 20 km/h and the last one third with a velocity of 60 km/h. What is the average velocity of the car in the whole journey?

A)  16 km/h                             

B)  18 km/h

C)  20 km/h                             

D)  30 km/h