Multiple Choice Questions on Two trains each 120 m long moving in opposite directions cross each other in 10 seconds If one........... for CDS Exam Preparation

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Multiple Choice Questions

Two trains each 120 m long moving in opposite directions cross each other in 10 seconds If one...........

Quantitative Aptitude (CDS) Problems on trains
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     Two trains, each 120 m long, moving in opposite directions cross each other in 10 seconds. If one is moving twice as fast the other, then the speed of the faster train is:

    57.6kmph

    Incorrect Answer


    56.7kmph

    Correct Answer


    54.2kmph

    Incorrect Answer


     58.1kmph

    Incorrect Answer
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    Explanation:


                Let the speed of the slower train be x m/sec.
      
             Then. speed of the faster train = 2x m/sec.

             Relative speed= (x + 2x) m/sec = 3x m/sec

             (120+120)/10 = 3x = 30x = 240

               x = 240/30 = 8.          x=8m/sec

            So speed of the faster train = 16m/sec
         
         = (16x18/5)km/hour = 57.6km/hour 
                

    By: bhavesh kumar singh
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