Multiple Choice Questions on A train 160 m long passes a traffic signal light in 8 seconds and another train of the same length t........... for CDS Exam Preparation

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Multiple Choice Questions

A train 160 m long passes a traffic signal light in 8 seconds and another train of the same length t...........

Quantitative Aptitude (CDS) Problems on trains
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    A train 160 m long passes a traffic signal light in 8 seconds and another train of the same length travels in the opposite direction in 5 seconds. the speed of the second train is:

    85kmph

    Incorrect Answer


    80kmph

    Incorrect Answer


    90.5kmph

    Incorrect Answer


    86.4kmph

    Correct Answer
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    Explanation:


                  Speed of first train= (160/8) = 20m/sec

               Let the speed of the second train be x m/sec 

                Relative speed = (20 +x )m/sec

                 [320/(20 + x )] = 5   

              320=100 + 5x     
     
                  x = 220 / 5 = 24m/sec   

               so speed of second train =(24 x 18/5) = 86.4kmph

    By: bhavesh kumar singh
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