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15 June, 19:46

Mary roller skates 18 miles in 1 1/2 hours what is her average speed in miles per hour

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  1. 15 June, 20:08
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    12miles per hour

    Explanation:

    Convert any mixed numbers to fractions.

    Then your initial equation becomes:

    181:32181:32

    Applying the fractions formula for division,

    =18*21*3=18*21*3

    =363=363

    Simplifying 36/3, the answer is

    =12
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