JEE Main Physics question

A particle moves for 20 seconds with velocity 3 m/s and then velocity 4 m/s for another 20 seconds and finally moves with velocity 5 m/s for next 20 seconds. What is the average velocity of the particle

• (A)3 m/s
• (B)4 m/sCorrect
• (C)5 m/s
• (D)Zero