In what time will a railway train 75 m long moving at the rate of 50 kmph pass a telegraph post on its way? Choose the correct choice from the following.
A) 3	B) 5.4	C) 4.3	D) 6.5	E) 7

Rationale: "t = 75 / 50 * 18 / 5 = 5.4 sec answer : b"
Answer: B