The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

A. 200 m
B. 225 m
C. 245 m
D. 250 m

• Let the length of the bridge:L
  The equation now is L+130/12.5m/s(45km/hr or12.5m/s)=30
  Solving, L =245m(option C)
  
  
• 12 years agoHelpfull: Yes(0) No(4)
• Speed = 45 x 5 m/sec = 25 m/sec.
  18 2
  Time = 30 sec.
  
  Let the length of bridge be x metres.
  
  Then, 130 + x = 25
  30 2
  2(130 + x) = 750
  
  x = 245 m.
• 10 years agoHelpfull: Yes(0) No(0)