A particle travels half the distance of ...

A particle travels half the distance of a straight journey with a speed 5 m/s. The remaining part of the distance is covered with speed 6 m/s for half the remaining time, and with speed 4 m/s for the other half of the remaining time. The average speed of the particle is

3 m/s

4 m/s

3/4 m/s

5 m/s

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