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 atthe rate of 5 km/h. If AB = 12 km and BC = 5 km, then its
average speedfor its journey from A to C and resultant average velocity direct from A to C are respectively

A

$$\frac{17}{4}$$ km/h and $$\frac{13}{4}$$ km/h

B

$$\frac{13}{4}$$ km/h and $$\frac{17}{4}$$ km/h

C

$$\frac{17}{9}$$ km/h and $$\frac{13}{9}$$ km/h

D

$$\frac{13}{9}$$ km/h and $$\frac{17}{9}$$ km/h