Average velocity of the man

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

2 61 8 \dfrac{2\sqrt{61}}{8} None of the above 2 61 5 \dfrac{2\sqrt{61}}{5} 22 22

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