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Quiz 3 : Question 6 of 10

David travels one-third of the distance from LA to SF at a speed of 40 miles an hour and the balance at a speed of 80 miles an hour. What is the average speed of David's travel from LA to SF?

A.     66.67 miles per hour

B.     48 miles per hour

C.     64 miles per hour

D.     60 miles per hour

E.     53.33 miles per hour


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