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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-27

  • question_answer
    A train moves with a speed of 30 km/h for 12 min and for next 8 min at a speed for 45 km/h. The average speed of the train is

    A)  37.5 km/h        

    B)  36 km/h

    C)  48 km/h           

    D)  30 km/h

    Correct Answer: B

    Solution :

    Distance covered in (12 min + 8 min) \[=\left[ 30\times \frac{12}{60}+45\times \frac{8}{60} \right]\]km =12 km Total distance = 12 km, Total time = 20 min \[=\frac{20}{60}\,\,h=\frac{1}{3}\,\,h\] Average speed \[=\frac{12}{\frac{1}{3}}\] km/h = 36 km/h Short Trick\[\frac{2xy}{x+y}=\frac{2\times 30\times 45}{75}=36\]


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