Multiple choice

The questions given below contain three statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question? What is the relative speed of two trains moving in opposite directions? (I) Both trains cross each other in 14 seconds. (II) Total length of both trains is 560 m. (III) The speed of one of them train is 60 km/hr.

  1. Only II and III

  2. Only I and III

  3. Only I and II

  4. All of these

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = Total distance / Time taken. Statement I gives the crossing time (14 seconds). Statement II gives total length (560 m). With these two, relative speed = 560/14 = 40 m/s. Statement III gives an individual train's speed (60 km/hr), which is not needed for calculating relative speed when trains move in opposite directions.

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