import matplotlib.pyplot as plt

person_x = 0.0
universe_size = 100.0
person_speed = 10.0
universe_increment = universe_size
seconds = 0

history = []

while person_x < universe_size:
    history.append((seconds, person_x/universe_size, universe_size-person_x))

    seconds += 1
    person_x += 10
    person_x += universe_increment*person_x/universe_size
    universe_size += universe_increment

    history.append((seconds,person_x/universe_size, universe_size-person_x))


plt.plot([x[0] for x in history], [x[1] for x in history])
plt.xlabel('seconds')
plt.ylabel('percent of universe covered')
plt.show()

plt.plot([x[0] for x in history], [x[2] for x in history])
plt.xlabel('seconds')
plt.ylabel('absolute distance from end')
plt.show()