The gel reader

You will write three small functions for the model gel of the lesson.

The idea. In the model, the distance in millimetres is $(62 - 14 \log_{10} \text{size}) \times \text{minutes}/60$. A band is read the other way round to find the size.

Your tasks.

1. Finish distance. It gives the distance run by a fragment, from its size in bp and the minutes.
2. Finish size_from_distance. It gives the size in bp from a distance and the minutes.
3. Finish order_on_gel. It takes a list of sizes and gives them in the order of the bands, from the one nearest to the well to the one farthest.