Subject: General Aptitude · Chapter: Problems on Trains · Exam: 2006 · Marks: · Difficulty:
A person standing on a railway platform noticed that a train took 21 seconds to completely pass through the platform which was 84 m long and it took 9 seconds in passing him. Find the speed of the train in km/hr.
Answer
Answer (as printed):
Explanation
Let the length of the train be x metres. Then, the train covers x metres in 9 seconds and (x + 84) metres in 21 seconds. So, length of the train = 63 m. 63 18 126 Speed of the train = m/sec = 7m/sec = 7 × km/hr = km/hr = 25.2 km/hr. 9 5 5
Explanation as extracted from the printed page; notation may be imperfect.