In what time will a train 100 metres long cross an electric pole, if its speed be 144 km/hr? Choose one:
A) 2.5 sec
B) 4.25 sec
C) 5 sec
D) 12.5 sec
E) none

Rationale: solution speed = ( 144 x 5 / 18 ) m / sec = 40 m / sec time taken = ( 100 / 40 ) sec = 2.5 sec . answer a
Answer: A