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You drive $20\text{ m/s}$ for $10\text{ min}$ and $30\text{ m/s}$ for $20\text{ min}$.

What is your average speed for the whole trip?

A

$20\text{ m/s}$

B

$25\text{ m/s}$

C

$27\text{ m/s}$

D

$50\text{ m/s}$

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