Question 18160
let both trains meet each other x hours after second train starts

Time taken by train 1 will be = x+3
distance covered by train 1  = 50(x+3)

Time taken by train 2 will be = x
distance covered by train 2  = 65(x)
 
bothe distances will be equal

so   65x = 50(x+3)
     65x = 50x+150
     65x - 50x = 150
     15x = 150
      x  = 150/15
      x  = 10  

ans 10 Hours

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