The impulse timer

You will time an impulse along a nerve fibre, choose the speed for a kind of fibre, and compare two fibres.

The idea. Time is distance divided by speed. A large myelinated fibre conducts at about $100\ \text{m/s}$, and an unmyelinated fibre at about $1\ \text{m/s}$.

Your tasks.

1. Finish time_ms. It gives the time in milliseconds, from the distance in metres and the speed in metres a second.
2. Finish fibre_speed. It gives 100 for a myelinated fibre and 1 for an unmyelinated one.
3. Finish times_longer. It tells how many times longer the slow fibre takes than the fast one over the same distance.