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Q32 (IAS/2010) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Quantitative aptitude topics Answer Verified

Running at a speed of 60 km per hour, a train passed through a 1-5 km long tunnel in two minutes. What is the length of the train ?

Result
Your answer: —  Â·  Correct: B
Explanation

At 60 km/h the train covers 1 km per minute, so in 2 minutes it travels 2 km. When a train fully passes through a tunnel the distance its front travels from the moment it enters until its rear exits equals the tunnel length plus the train length. Thus: tunnel length + train length = distance travelled in 2 minutes. Substituting values: 1.5 km + train length = 2.0 km, so train length = 2.0 km − 1.5 km = 0.5 km = 500 m. Therefore the correct option is 500 m.

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