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26 March, 11:16

Michiko usually runs d miles in t minutes, but today she ran an extra 9 miles, which took her an extra 70 minutes. Write the equation for her normal speed: r0 = Now, write the equation for her speed today: rT=

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  1. 26 March, 14:56
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    Usual distance michiko runs = d miles

    Time=t

    normal speed = r₀

    speed today = r₁

    According to the question,

    r₀ = d/t

    r₁ = d+9/t+70.
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