# A man walks towards the north a distance of 10 km at rate of 5 km per hour and then walks towards the west a distance of 12 km in 3hours. What is the average velocity of the man?

$\frac{22}{5}$ km per hour

$\frac{2\sqrt{61}}{8}$ km per hour

$\frac{2\sqrt{61}}{5}$ km per hour

None of the above

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