Bubbles from a water plant

A water plant is lit by a lamp at five distances, and the oxygen bubbles are counted for $3$ minutes at each. You will find the rate at each distance, the distance with the fastest rate, and whether the rate always falls as the lamp moves away. Then the program draws the rates.

The idea. Rate = bubbles ÷ minutes. Less light reaches the plant from far away.

Your tasks.

1. Set rates to the bubbles per minute at each distance, in order.
2. Set best_distance to the distance with the highest rate.
3. Set always_falls to True if every rate is smaller than the one before it, and False if not.