This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
There are two electrodes placed at a distance of 4.5cm and it takes 1.5ms for current to be propagated along the nerve from one to another electrode. The velocity of nerve conduction is ? 
Select and explain. 
A. 60m/s, B. 30m/s, C. 45m/s, D. 80m/s
B: 30m/s
Answer: B: 30m/s 
Explanation: Ans. is'b'i.e., 30m/s Velocity = Distance traveled / Time taken to travel distance = 4.5 cm / 1.5 ms = 3 cm/ms = 30 m/sec