Length of train = 450 m Speed of train = 65 km/hr and speed of girl = 5 km/hr Since, they are moving in the same direction, relative speed = 65 - 5 = 60 km/hr = $$60 imes frac{5}{18} = frac{50}{3}$$ m/s Let time taken = $$t$$ sec => $$t = frac{450}{frac{50}{3}}$$ => $$t = 450 imes frac{3}{50}$$ => $$t = 9 imes 3 = 27$$ sec