RRB RPF RPSF SI and CONS Model Papers 4 with solutions

Question : 2 of 122

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On a journey across Kolkata, a taxi averages 50 km per hour for 50% of the distance, 40 km per hour for 40% of it and 20 km per hour for the remaining distance. The average speed, in km/h, for the whole journey is

Validate

Solution:

(2) Let the total distance = 100 km
Total time

= {50}/{50}+ {40}/{40}+ {10}/{20}

=1+1+ {1}/{2}= {5}/{2}

hours
∴Average speed

= {\text" Distance "}/{\text" Time "}=\ {100}/{ {5}/{2}}=40 {kmph}

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