Correct Answer: Option D
Let the speed of the second train be x km/hr.
Relative speed = (x + 50) km/hr
= [ (x + 50) x 5/18] m/sec
= [ (250 + 5x)/18] m/sec.
Distance covered = (108 + 112) = 220 m.
Therefore, 220/((250+5x)/18)= 6
=> 250 + 5x = 660
=> x = 82 km/hr.
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