two trains, 130 and 110 metres long, while going in the same direction, the faster train takes one minutes to pass the other completely. if they are moving in opposite directions, they pass each other completely in 3 seconds. find the speed of the slower train?

1) 30 km/hr
2) 38 m/s
3) 30 m/s
4) none of these

• use the concept of relative velocity
  total distance-240 m
  when going in same direction
  240/x-y=60
  x-y=4
  when going in different direction
  240/x+y=3
  x+y=80
  solving the equations we get
  x=42 and y=38
  speed of faster train is 42m/s
  and slower one is 38m/s.
• 9 years agoHelpfull: Yes(1) No(0)
• speed of slower train= 38m/s
  bcoz
  total distance=130+110=240
  so 240/(a-b)=60
  a-b=4 ................(1)
  240/(a+b)=3
  a+b=80 .................(2)
  from (1) & (2)
  a=42
  b=38
  so speed of slower train=38
• 11 years agoHelpfull: Yes(0) No(0)
• let the speed of the 1ster train x m/s & speed of slower train y m/s.
  (130+110)/(x-Y)=60...................(1)
  (130+110)/(x+y)=3.....................(2)
  on solving eq.(1) & (2) we get x=42 m/s & y =38 m/s
  so speed of the slower train is 38 m/s.
• 8 years agoHelpfull: Yes(0) No(0)