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A particle moves towards east from a point A to a point B at the rate of $4\; km/h$ and then towards north from B to C at the rate of $%\; km/h$. If $AB = 12\; km$ and $BC = 5\; km$, then its average speed for its journey from A to C and resultant average velocity direct from A to C are respectively

( A ) $\frac{13}{9} \; km/h$ and $\frac{17}{9} \; km/h$
( B ) $\frac{17}{4} \; km/h$ and $\frac{13}{4} \; km/h$
( C ) $\frac{13}{4} \; km/h$ and $\frac{17}{4} \; km/h$
( D ) $\frac{17}{9} \; km/h$ and $\frac{13}{9} \; km/h$

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