A particle moves in straight line in sam...

A particle moves in straight line in same direction for 20 seconds with velocity `3 m//s` and the moves with velocity `4 m//s` for another 20 sec and finally moves with velocity `5 m//s` for next 20 seconds. What is the average velocity of the particle?

`3m//s`

`4m//s`

`5m//s`

Zero

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