A delivery truck leaves the depot at 9am, drives 20km and arrives at 9:30. At 10am it drives another 15km, arriving at 10:18am. Twenty minutes later it takes the same route back to the depot, arriving at 11:10am a) find the average speed (km/hr) for each three sections  b) find its average speed for the whole trip

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Chapter1: Units, Trigonometry. And Vectors
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A delivery truck leaves the depot at 9am, drives 20km and arrives at 9:30. At 10am it drives another 15km, arriving at 10:18am. Twenty minutes later it takes the same route back to the depot, arriving at 11:10am

a) find the average speed (km/hr) for each three sections 

b) find its average speed for the whole trip (just for the time it was moving)

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