A train running at a speed of 81 km/h passes a 375 m long tunnel in 40 seconds. What is the length of the train (in m)?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 525
To pass through a tunnel completely, the train covers its own length plus the length of the tunnel, from the moment its front enters until its back leaves.
Speed \(\displaystyle =81\times\frac{5}{18}=22.5\) m/s
Distance covered in 40 s \(=22.5\times40=900\) m
Length of the train \(=900-375=525\) m