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A person travels three equal distance...

A person travels three equal distances at a speed of `x` km/hr, `y` km/hr and `z\ ` knyhr respectively. What is the average speed for the whole journey? `(x y z)/(3(x y+y z+z x))` b. `(x y z)/((x y+y z+z x))` c. `((x y+y z+z x))/(x y z)` d. `(3x y z)/((x y+y z+z x))`

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