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16 May, 14:13

A brother and sister leave school at the same time, moving in opposite directions. If the brother walks away at a speed of 3.5 miles per hour, and the sister runs at a speed of 7.5 miles per hour, how far apart are they after half an hour

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  1. 16 May, 14:23
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    5.5 miles

    Step-by-step explanation:

    The brother walks 3.5 miles in 1 hour. In half and hour, he walks half of 3.5 miles, or 1.75 miles.

    The sister runs 7.5 miles in 1 hour. In half an hour, she runs half of 7.5 miles, or 3.75 miles.

    Add the two distances:

    1.75 miles + 3.75 miles = 5.5 miles
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