In a journey, the first one - third of ...

In a journey, the first one - third of the distance is covered at a speed of 20km/hr, the second `1/3` at speed of 30 km/hrand the last `1/3` at a speed of 24 km/hr. The average speed in km/hr for the whole journey is

`75/3`

`73/3`

`74/3`

`72/3`

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