 
<translate> Speed nke ụgbọ okporo ígwè na mita / sec = 72000/3600 = 20 Ogologo njem ụgbọ oloko gafere na ikpo okwu = 30 * 20 = 600 = Ogologo ụgbọ oloko + Ogologo ikpo okwu Ebe ụgbọ okporo ígwè gafere iji gafee nwoke ahụ = 15 * 20 = 300 = Ogologo ụgbọ okporo ígwè Ogologo nke ikpo okwu = 600 - 300 = 300 N'ihi ya, azịza ya bụ (C). <eng> Speed of the train in metres/sec = 72000/3600 = 20
Distance travelled by train to cross the platform = 30 * 20 = 600 = Length of train + Length of platform
Distance travelled by train to cross the man = 15 * 20 = 300 = Length of train
Length of platform = 600 - 300 = 300
Thus, the answer is (C). 