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1330 3) In physical education class, Lizzie ran the 50-yard dash in t seconds. Derive an expression for her average speed, r, in miles

1330 3) In physical education class, Lizzie ran the 50-yard dash in t seconds. Derive an expression for her average speed, r, in miles per hour, during the 50-yard dash in terms of t. Use the formula r=where d represents the distance in miles that Lizzie ran. Write the expression in simplified, exact form. Show your work. 50

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