EXERCISE 11.20 salesman leaves home at 08:00 and travels for 11 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 hour. 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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