Q. Two trains in the same direction at 50 & 32 kmph respectively. A man in the slower train observes the 15 seconds elapse before the faster train completely passes him. What is the length of faster train?

• 75m
• 14 years agoHelpfull: Yes(3) No(0)
• both trains travel in same drc... so relative velocity of fast train wrt to slo train will be (50-32=18 kmph 0r 5 m/s)
  so distance covered by faster train wrt to slower one = 5*15=75 m which will be the length os the train.
  
  ans :: 75 m is the length.
• 14 years agoHelpfull: Yes(3) No(0)
• Velocity=50-32(since both trains are moving in the same direction)=18km/hr...
  time=15sec... Length=(18*15)/3600km=0.075km= 75m(answer)...
• 14 years agoHelpfull: Yes(1) No(0)
• 342 m
• 14 years agoHelpfull: Yes(0) No(2)
• You need to convert kmph to meter/sec.So multiply relative speed by 5/18.
  D= T*S=15*(50-32)*5/18=75m
  
• 12 years agoHelpfull: Yes(0) No(0)