Railways Quantitative Aptitude Trains Sample Paper Trains Sample Test Paper-13

  • question_answer
    A train does a journey without stopping in 8 hours. If it had travelled 5 km an hour faster, it would have done the journey in 6 hours 40 min, its slower speed is

    A)  32 km/hr

    B)  25 km/hr

    C)  28 km/hr          

    D)  40 km/hr

    Correct Answer: B

    Solution :

    [b] Let slower speed = u km/hr. As the distance is fixed \[u\times 8=(u+5)\times \frac{20}{3}\,\,\,\,[\because 6\,hr\,\,40\,\min =6\,hr+\frac{40}{60}\,hr\] \[=6\frac{2}{3}=\frac{20}{3}\,hrs.]\] \[\Rightarrow \] \[24\,u=20\,u+100\] \[\Rightarrow \] \[4\,u=100\] \[\Rightarrow \] \[u=25\,km/hr\]

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