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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-19

  • question_answer
    A train runs for 20 min at the speed of 75 km/h, in the next 25 min at the speed of 60 km/h and the least 15 min at the rate of 40 km/h, find out the average speed of the train.

    A)  65 km/h           

    B)  58 km/h

    C)  55 km/h           

    D)  60 km/h

    Correct Answer: D

    Solution :

    \[\because \,\,\,\,\,{{s}_{1}}=75\times \frac{20}{60}=25\,\,\text{km}\] \[{{s}_{2}}=60\times \frac{25}{60}=25\,\,\text{km}\] And      \[\,{{s}_{3}}=40\times \frac{15}{60}=10\,\,\text{km}\] Average speed of train \[(s)=\frac{25+25+10}{\frac{60}{60}}=60\,\,\text{km/h}\]


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