SSC CHSL 2023 · PYQ · Speed, Distance and Time · medium
A truck covers three equal distances of 100 km at the speed of 200 km/hr, 300 km/hr and 600 km/hr. Find the average speed of the truck for the whole journey.
A.250 km/h
B.366.66 km/h
C.327 km/h
D.300 km/h✓ Correct
Explanation
Using harmonic mean for equal distances: Average speed = 3/(1/200+1/300+1/600) = 3/((3+2+1)/600) = 3×600/6 = 300 km/h.
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