Find the length of the bridge,which a train 120 m long travelling at 54 kmph can cross in 30 seconds.
a)340 m b)350 m c)330 m d)390 m

• let length of bridge is X m,
  speed in m/s =54*(5/18)=15m/s
  (120+x)/15=30
  x=330m
• 9 years agoHelpfull: Yes(0) No(0)
• ans c
  time= distance/speed
  x= length of bridge
  speed= 54*5/18 m/sec
  30=(120+x)/15
  30*15=120+x
  450-120=x
  x=330 m
• 9 years agoHelpfull: Yes(0) No(0)