<image>The following math problem is provided with an image placeholder. Keep the  identifier in the translated text.

As shown in the image, the Number 3 bus travels from the East Station to the West Station. 
(1) Please describe the travel conditions of the Number 3 bus.
(2) The bus's speed increases from 0 km/h to ____ km/h within 4 minutes.
(3) The bus's speed decreases from ____ minutes to ____ minutes.
(4) The bus maintains a constant speed from ____ minutes to ____ minutes, which is ____ km/h.
(5) Please propose another math problem and try to solve it.