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Problems on Trains - General Aptitude

Q1:

A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?

A 230 m

B 240 m

C 260 m

D 72 sec

E None of these

ANS:A - 230 m

Relative speed = (120 + 80) km/hr  
   = 200 x  5 m/sec
18
   
   = 500 m/sec.
  9
  Let the length of the other train be x metres.  
Then, x + 270 = 500
   9   9
  x + 270 = 500 x = 230.