Correct Answer: Option B
Speed of the train relative to man = (125/10) m/sec
=(25/2) m/sec.
= (25/2) x (18/5)km/hr
= 45 km/hr.
Let the speed of the train be x km/hr.
Then, relative speed = (x - 5) km/hr.
So, x - 5 = 45
=> x = 50 km/hr.
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