A 280 m long train, travelling at a uniform speed, crosses a platform in 60 seconds and a man standing on the platform in 20 seconds. What is the length of the platform?

• 560 m.
  
  If length of the platform=x m. and speed of the train=y m/s, then
  Time for crossing platform=(280+x)/y=60 ---(i) &
  Time for crossing a man=280/y=20 ---(ii)
  From (i) & (ii), x=560, y=14
• 8 years agoHelpfull: Yes(1) No(0)