The answer is: " 52 mi / h " ; or, write as: " 52 m.p.h. " .
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Explanation:
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Given:
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"286 mi per 5.5 h " ; or, "(286 mi / 5.5 h)" ;
→ Convert to "miles per (unit hour, or single hour)" .
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So; 286 mi / 5.5 h = (286/5.5) mi / h = "52 mi / h" ; or, write as: "52 m.p.h." .
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