Question

9. A body moving along straight line covers a distance
in three equal parts with speed 2 m/s, 3 m/s and
4 m/s, then its average speed is
(1) 12 m/s

Answer 1

Answer:

(3x +40)+(x-20)=180

3x+40+ x-20=180

4x+20=180

4x=180-20

x=160/4=40