# Set start position, speed of a plane.
# Position is in meters, speed is measured in meters per minute.
position = 0.0
speed = 10000.0

# Each minute, the planes speed slows down by 20 meters per minute.
# Keep track of the speed and position over one hour, by
# recalculating position and speed every minute.
for minute in range(0,60):
    position = position + speed
    speed = speed - 20.0

# Finally, output status
print 'After an hour, the airplane'
print 'is at a distance of', position, 'meters'
print 'and has a speed of', speed, 'meters per minute'