ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    Two trains, A and B, cross each other in 15 seconds and

    35 seconds respectively, when running in opposite and the same direction respectively. If the speed of the slower trains is n% of the speed of the faster trains, then find the value of (n ├Ч 2).
    A 40 Correct Answer Incorrect Answer
    B 50 Correct Answer Incorrect Answer
    C 75 Correct Answer Incorrect Answer
    D 80 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of train A be S1 and the speed of train B be S2. And length of train A be L1 and the length of train B be L2. According to the question, (S1 + S2) = (L1 + LB)/15 And, (S1 - S2) = (L1 + LB)/35 Here, the length of both the train is equal. So, (S1 + S2)┬а├Ч┬а15 = (S1 - S2)┬а├Ч┬а35 => 15 S1 + 15 S2 = 35 S1 тАУ 35 S2 => 20 S1 = 50 S2 => S1/S2 = 50/20 = 5/2 Speed of slower train = n% of faster train => n% = (2/5)┬а├Ч┬а100 = 40% Therefore, (n┬а├Ч┬а2) = 40 ├Ч┬а2 = 80

    Practice Next
    More Trains Questions

    Relevant for Exams:

    ask-question