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A particle moves for 20 s with velocity ...

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

A

`3 m//s`

B

`4 m//s`

C

`5 m//s`

D

zero

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