What is speed of train? I. The train can cross 100 m long platform in 10 sec &…
2025
What is speed of train? I. The train can cross 100 m long platform in 10 sec & a trees in 5 sec. II. The train can cross another train of same length coming from opposite direction at same speed in 20 sec.
Answer: D. Only statement I alone is sufficient to answer. — Statement I is sufficient: crossing a tree in 5 seconds gives train length = 5v, and crossing a 100 m platform in 10 seconds gives length + 100 = 10v. Hence v…
- A.
Only statement II alone is sufficient to answer.
- B.
Either statement I or statement II alone is sufficient to answer.
- C.
Both statement I & II together are necessary to answer.
- D.
Only statement I alone is sufficient to answer.
- E.
Neither statement I nor statement II is sufficient to answer.
Attempted by 29 students.
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Correct answer: D
Statement I is sufficient: crossing a tree in 5 seconds gives train length = 5v, and crossing a 100 m platform in 10 seconds gives length + 100 = 10v. Hence v can be found.
Statement II only gives length/speed = 20 for two equal trains moving in opposite directions. It does not determine speed alone.
Therefore only statement I alone is sufficient.