Austin departs from home at 4:00 and travels 30 kilometres at a constant speed of 60 km/h. After a 15-minute stop, he continues driving for another 20 kilometres at a constant speed of 80 km/h. Following a brief 15-minute stay at his destination, he commences his return journey home, maintaining a constant speed of 50 km/h. Draw a distance-time graph to illustrate his entire journey.

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