Time and Distance Practice Test 2 with solutions

Question : 21 of 40

Marks: +1, -0

A person travels three equal distances at a speed of x km/hr, y km/hr and z km/hr respectively. What is the average speed for whole journey?

Solution:

Let the equal distances be d km; then,
Average speed =

{3d}/{d/x+d/y+d/z}

3/{{xy+yz+zx}/{xyz}}

{3xyz}/{xy+yz+zx}

km/hr

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