two trains running at the rate of 75 km and 60 km an hour respectively on parallel rails in opposite directions are observed to pass each other in 8 seconds, and when they are running in same direction at the same rates as before a person sitting in the faster train observes that he passes the other in 31 1/2 seconds. find the lengths of the trains.

1) length 1 =168.75 m, length 2 =131.25 m
2) length 1 =125.41 m, length 2 =117.61 m
3) length 1 =447.50 m, length 2 =334.21 m
4) length 1=134.26 m, length 2 =108.72 m

• 1) length 1 =168.75 m, length 2 =131.25 m
  
  sum of length of two trains = 135*8*5/18 = 300mtr
  length of slower train = 15*(5/18)*(63/2) = 131.25 mtr
  lenth of other train = 300-131.25= 168.75 mtrs
• 12 years agoHelpfull: Yes(2) No(1)