In what time will a train 100 m long cross an electric pole, it its speed be 90 km/hr?
Choices:
A) 2.5
B) 2.9
C) 4 sec
D) 2.8
E) 2.1

Rationale: "speed = 90 * 5 / 18 = 25 m / sec time taken = 100 / 25 = 4 sec . answer : c"
Answer: C