In what time will a railway train 52 m long moving at the rate of 24 kmph pass a telegraph post on its way? Choose the most appropriate option:
A) 3 sec
B) 4 sec
C) 8 sec
D) 6 sec
E) 7 sec

Rationale: t = 52 / 24 * 18 / 5 = 8 sec answer : c
Answer: C