A: Let the length of train be x. Speed of train past a pole = 15/15 m/sec. Length of train past platform = 100/25 m. Speed of train = x + 25/x = 150 m/sec. Length of train = x + 100 = 150 m. The answer is (D).
Answer the following multiple choice question with options (a), (b), (c), (d), (e) by reasoning step-by-step.
Q:A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is: Answer Choices: A)145 B)146 C)147 D)150 E)152