Symbiosis National Aptitude Test SNAP 2014 Paper

Question : 32 of 150

Marks: +1, -0

On a journey across Kolkata, a taxi averages 40 kmph for 60% of distance, 30 kmph for 20% of the distance, and 10 kmph for the remainder. The average speed of the whole journey is

25 kmph
26 kmph
24 kmph
30 kmph

Validate

Solution:

Let total distance be d.
time taken for 60% distance =

{0.6d}/{40}

{3d}/{200} h

time taken for 20% distance =

{0.2d}/{30}

d/{150} h

time taken for remaining 20% distance =

{0.2d}/{10}

d/{50} h

average speed =

d/{{3d}/{200}+d/{150}+d/{150}}

{200×150×50}/{22500+10000+30000}

{200×150×50}/{62500}

= 24 kmph

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