Please answer the following question by reasoning step-by-step.
A train 124 m long running at 68 kmph crosses a platform in 19 sec. What is the length of the platform?\nOptions:\n(A) 338\n(B) 234\n(C) 240\n(D) 881\n(E) 271

(B)
D = 68 * 5/18 = 19 = 358 – 124 = 234.

The answer: (B)