Multiple choice

The questions given below contain two statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question ? Mark answer - What is the length of the tunnel (in metres) ? I. A train 700 m. long is running at the speed of 72 km/hr. II. It crosses a tunnel in 1 minute.

  1. statement I alone is sufficient but statement II alone is not sufficient.

  2. statement II alone is sufficient but statement I alone is not sufficient.

  3. each statement alone (either I or II) is sufficient.

  4. statement I and II together are not sufficient.

  5. both statements together are sufficient, but neither statement alone is sufficient.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Tunnel length + train length = speed × time to cross. Statement I: Train length = 700m, speed = 72 km/hr = 20 m/s. Need time to find tunnel length. Statement II: Time = 1 minute = 60 seconds. Need train length and speed. Neither alone sufficient. Together: distance = speed × time = 20 × 60 = 1200m. This is train + tunnel, so tunnel = 1200 - 700 = 500m. Both statements needed.

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