A train 180 m long running at 75 kmph crosses a platform in 40 sec. What is the length of the platform?  Choose the correct choice from the following choices:
A) 687 B) 638 C) 683 D) 726 E) 267

Rationale: "d = 75 * 5 / 18 = 40 = 833 â € “ 150 = 683 answer : c"
Answer: C