πŸ“’ Too many exams? Don’t know which one suits you best? Book Your Free Expert πŸ‘‰ call Now!


    Question

    Trains 'M' and 'N' travel at speeds of 72 km/h and 90

    km/h, respectively. It takes train 'M' 32 seconds to pass a certain platform, while train 'N' requires only 24 seconds to cross the same platform. Determine the length ratio of train 'M' to train 'N'.
    A 7:2 Correct Answer Incorrect Answer
    B 4:5 Correct Answer Incorrect Answer
    C 2:3 Correct Answer Incorrect Answer
    D cannot be determined Correct Answer Incorrect Answer
    E 5:4 Correct Answer Incorrect Answer

    Solution

    Let the length of the platform be β€˜x’ metres Let the length of trains β€˜M’ and β€˜N’ be β€˜a’ metres and β€˜b’ metres, respectively According to the question, 72 Γ— 5/18 = (x + a)/32 20 Γ— 32 = x + a Or, x + a = 640 Or, x = 640 – a.….. (1) Also, 90 Γ— 5/18 = (x + b)/24 25 Γ— 24 = x + b Or, x + b = 600 Or, x = 600 – b…… (2) From equations (1) and (2), we get 640 – a = 600 – b Or, a – b = 40 Therefore, required ratio cannot be determined. Hence, option d.

    Practice Next

    Relevant for Exams:

    ask-question

    Not sure which exam is best for you Talk to our expert

    Get My Free Call