In what time will a train 120 metres long cross an electric pole, if its speed be 72 km/hr?
Choose the correct choice from the following choices
A) 7 sec	B) 6 sec	C) 8 sec	D) 9 sec	E) 5 sec

Rationale: "solution speed = ( 72 x 5 / 18 ) m / sec = 20 m / sec time taken = ( 120 / 20 ) sec = 6 sec . answer b"
Answer: B