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SSC Quantitative Aptitude Average Question Bank Average (I)

  • question_answer
    A car covers four successive 7 km distance at speeds of 10 km/h, 20 km/h, 30 km/h and 60 km/h, respectively. Its average speed over this distance is [SSC CGL Tier II, 2015]

    A) 30 km/h,

    B) 20 km/h

    C) 60 km/h

    D) 40 km/h

    Correct Answer: B

    Solution :

    [b] Required average speed \[=\frac{7\times 4}{\frac{7}{10}+\frac{7}{20}+\frac{7}{30}+\frac{7}{60}}\]     \[\left( \therefore \text{Speed=}\frac{\text{Distance}}{\text{Time}} \right)\] \[=\frac{28\times 60}{7\times 6+7\times 3+7\times 2+7\times 1}\] \[=\frac{28\times 60}{42+21+14+7}=\frac{28\times 60}{84}=20\,km/h\]


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