Subject: General Aptitude · Chapter: Problems on Trains · Exam: · Marks: · Difficulty:
A train 100 m long travelling at 60 km/hr passes another train, twice as fast as this train and travelling in opposite direction, in 10 seconds. Find the length of the seocnd train. (S.S.C., 2008)
Answer
Answer (as printed):
Explanation
Relative speed = (60 + 120) km/hr = 180 × m/sec = 50 m/sec. 18 Let the length of the second train be x metres. x + 100 Then, = 50 ⇒ x + 100 = 500 ⇒ x = 400. 10 Hence, length of second train = 400 m.
Explanation as extracted from the printed page; notation may be imperfect.