A person travels from A to B at an average speed of 60 km/hr and B to C at 50 km/hr and C to D at 40 km/hr. The distance from A to B, B to C and C to Dare equal. What is the average speed of the whole journey?

 a) 37.68 km/hr
 b) 48.65 km/hr
 c) 45.68 km/hr
 d) 50.00 km/hr
TNPSC Jailor-2016

48.65 km/hr.
Solution
Average speed is Harmonic mean of speeds in this case.
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