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Home Aptitude Problems on Trains See What Others Are Saying!
  • Question
  • The distance travelled by a train is 1830 km. The speed of the train is one more than twice the time taken to travel the distance. What will be the respective ratio of the speed of the train and time taken to travel?


  • Options
  • A. 30 : 61
  • B. 61 : 30
  • C. 25 : 51
  • D. 51 : 25

  • Correct Answer
  • 61 : 30 

    Explanation

    Let time taken to cover the distance = t
    ? Speed = (2t + 1)
    ? t(2t + 1) = 1830 ? 2t2 + t = 1830
    ? 2t2 + t - 1830 = 0
    ? t = -1 ± ?(1)2 - 4 x 2 x(-1830) / 2 x 2
    = -1 ± ?1 + 14640 / 4
    = -1 ± 121 / 4
    Taking '+' sign t = -1 + 121 / 4 = 120/4 = 30
    ? Required ratio = (2 x 30 + 1) : 30 = 61 : 30


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    • 2. 
      The average age of 45 students in a class in 13 yr, 15 new students with an average age of 18 yr join the class. What is the average age of all the students in the class?

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    • 3. 
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