A train running at the speed of 30 km/hr crosses a pole in 12 seconds. What is the length of the train?
Choose the correct option.
A) 70
B) 80
C) 90
D) 100
E) 110

Rationale: "speed = ( 30 x ( 5 / 18 ) m / sec = ( 25 / 3 ) m / sec . length of the train = ( speed x time ) . length of the train = ( ( 25 / 3 ) x 12 ) m = 100 m d"
Answer: D