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Average speed over three segments

CMAT 2018 · Quantitative Techniques & Data Interpretation · Easy · Time Speed Distance

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Rakesh covers 12 km at 6 km/hr, 36 km at 9 km/hr and then 32 km at 4 km/hr. Find the approximate average speed in covering the whole distance.

  1. A.

    4.2 km/hr

  2. B.

    5.52 km/hr

  3. C.

    5.71 km/hr

  4. D.

    5 km/hr

Answer

C

Explanation

Total Distance = 12+36+32=80 km12 + 36 + 32 = 80\text{ km}. Total Time = 126+369+324=2+4+8=14 hours\frac{12}{6} + \frac{36}{9} + \frac{32}{4} = 2 + 4 + 8 = 14\text{ hours}. Average Speed = 8014≈5.71 km/hr\frac{80}{14} \approx 5.71\text{ km/hr}.

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