A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed.

• If length of train is l and speed of train is s, then
  l/s = 8
  (l+180)/s = 20
  (l+180)/l = 20/8 =5/2
  2l+360 =5*l
  3*l= 360
  l=120 mtrs
  s= l/8 = 120/8 = 15 m/sec
• 13 years agoHelpfull: Yes(4) No(2)