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You drive $4.0\text{ km}$ at $35\text{ km/h}$ and then another $4.0\text{ km}$ at $55\text{ km/h}$.

What is your average speed for the whole $8.0\text{ km}$ trip?

A

$10\text{ km/h}$

B

$43\text{ km/h}$

C

$45\text{ km/h}$

D

$47\text{ km/h}$

E

$80\text{ km/h}$

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