Two trains are 2 kms apart. Speed of one train is 20m/s and the other train is running at 30 m/s. Lengths of the trains are 200 and 300m. In how much time do the trains cross each other?

• total distance 2500m and combine speed of train is 50m/s thus time taken is 50seconds
• 13 years agoHelpfull: Yes(27) No(0)
• relative speed of the trains=(20+30)m/s=50 m/s
  total distance to cross each other=2km+200m+300m=2500m
  so,..time to cross=dist./speed=2500/50= 50 sec.
• 13 years agoHelpfull: Yes(21) No(2)
• time = 10 sec.
  relative velocity of train = 20+30 m/s =50 m/s
  total distance for travel = length of two trains = 200+300 m =500m
  time = distance/speed = 500/50 s = 10 sec
• 13 years agoHelpfull: Yes(6) No(10)
• Both Trains will come at a point in 40 seconds & another 10 seconds to cross each other. So the trains would cross each other in 50 seconds.
• 13 years agoHelpfull: Yes(2) No(3)
• speed of 1st train=20 m/s
  speed of 2nd train=30 m/s
  lengths are=200m & 300m respectively.
  let x be the time of two trains,then
  (20*x)+(30*x)+500=2000
  50x+500=2000
  x=30.so answer is 30 seconds.
  
• 13 years agoHelpfull: Yes(1) No(14)
• total distance=2km+500m=2500mtr
  relative speed =30-20=10m/s
  time=2500/10
  =250 second
  =4 minute 10 second
• 13 years agoHelpfull: Yes(1) No(10)
• relative velocity between two trains =50m/s
  distance=2kms+500m
  =5/2kms
  relative velocity in km/h=50*(5/18)=250/18
  ime taken o cross thee trains=(5/2)/(250/18)=(9/50)h0urs (or)10.8minutes
• 13 years agoHelpfull: Yes(0) No(3)
• keep one train constant so that the other train has the velocity of (20+30)m/s since they are moving opposite direction.now time = (2000/50)sec
• 13 years agoHelpfull: Yes(0) No(3)
• ans is 50 seconds
• 9 years agoHelpfull: Yes(0) No(1)
• 2000+500=2500.
  2500/10=250s
  250/60=4m 10s
• 9 years agoHelpfull: Yes(0) No(2)
• Opposite direction
  Speed1 + speed 2=distance/Time
  Distance =200+300=500
  Then
  20+30=500/time
  Time=500/50=10second
• 7 years agoHelpfull: Yes(0) No(1)