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A salesman leaves home at 08:00 and travels for $$1\frac{1}{2}\;$$ hours at an average speed of 60 km/h. He then stops for 30 minutes .He continues for 2 more hours at 50 km/h and stops for 1 hours. He then returns home and arrives home at 1600.
a). show this in a travel graph.
b). calculate his average speed for his return journey

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