## Speed Time And Distance

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