(A) 12.87 Second
(B) 16.80 Second
(C) 19.63 Second
(D) 34.65 Second
Correct Option is: C
Speed of a girl = 15 km/hr
speed of train = 180 km/hr
By using the condition,
The speed values of train and the moving object are subtracted if they are moving in same direction.
Speed of train relative to walking person (girl) = (180 -15)kmph= 165 kmph
Convert km/hr into m/s, 165 kmph = (165*5/18) m/s
= 45.83 m/s
Distance to be covered by the train = (600+300)m
= 900m
Therefore, time taken by the train to cross the girl = Distance over speed
= 900 /45.83
= 19.63
Hence the time taken by the train to cross the girl is 19.63 Seconds