A car moves towards north at a speed of $54 \,km / h$ for $1 \,h$. Then it moves eastward with same speed for same duration. The average speed and velocity of car for complete journey is ..........
- A$54 \,km / h , 0$
- B$15 \,m / s , \frac{15}{\sqrt{2}} \,m / s$
- C$0,0$
- D$0, \frac{54}{\sqrt{2}} \,km / h$
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