A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train?	Choose the most appropriate option
A) 190 metres  B) 160 metres  C) 200 metres  D) 120 metres  E) 250 metres

Rationale: speed of the train , v = 40 km / hr = 40000 / 3600 m / s = 400 / 36 m / s time taken to cross , t = 18 s distance covered , d = vt = ( 400 / 36 ) × 18 = 200 m distance covered is equal to the length of the train = 200 m correct answer is 200 metres
Answer: C