Multiple choice

Each of the questions below consists of a question and three statements numbered I, II and III given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read all the statements and give answer: How much time will the train A take to cross another train B running in opposite direction? I. Train A crosses a signal pole in 18s II. Ratio of the speed of trains A and B is 3:5 III. Length of two trains together is 1100m

  1. Only I

  2. All the given statements are Insufficient

  3. Only I and II

  4. Only III

  5. Only II
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To find crossing time in opposite direction, we need total length and relative speed. Statement I gives L_A/V_A = 18 (one equation, two unknowns). Statement II gives V_B = (5/3)V_A. Statement III gives L_A + L_B = 1100m. Combining all: Time = (L_A + L_B) / (V_A + V_B) = 1100 / ((8/3)V_A). But V_A remains unknown since we have L_A = 18V_A and L_A + L_B = 1100, which doesn't help isolate V_A. The system is underdetermined.

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