Speed Time And Distance

Question
A person travels three equal distance at a speed of x km/hr, y km/hr and z km/hr respectively. What is the average speed for the whole journey ?
Options:
A. $$\frac{{xyz}}{{3\left( {xy + yz + zx} \right)}}$$    km/hr
B. $$\frac{{xyz}}{{\left( {xy + yz + zx} \right)}}$$    km/hr
C. $$\frac{{\left( {xy + yz + zx} \right)}}{{xyz}}$$    km/hr
D. $$\frac{{3xyz}}{{\left( {xy + yz + zx} \right)}}$$    km/hr

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Answer: Option D

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