one train has crossing a bridge of length 340 m in 42 sec and same train has crossing a another bridge of 500 m in 50 sec. what is the approximate speed of the train in km/h?
1)60 2)64.8 3)72 4)None

• length of train = l m
  speed of train = v m/s then
  
  340+l = 42v
  500+l = 50v
  subtract, 8v = 160
  => v = 20m/s = 72 kmph
• 8 years agoHelpfull: Yes(29) No(0)
• 500-340=160
  50-42=8
  Now160/8*18/5=72
• 8 years agoHelpfull: Yes(4) No(2)
• (500-340)/(50-42)=160/8=20m
  for in km/hr 20*18/5=72kmph option 3
• 8 years agoHelpfull: Yes(2) No(0)