Roberta drove 50 miles in 2 hours. Her rate in miles per hour is

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Roberta drove 50 miles in 2 hours. Her rate in miles per hour is equivalent to which of the following proportions?

Indicateallpossible values.

A、5 to 20
B、100 to 4
C、400 to 16
D、20 to 500

答案：B,C

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