Since Curtis drove for 15 hours and traveled 870 miles, if you are trying to find the miles per hour (mph) you must divide the number of miles by the number of hours, so 870/15. Once you do that, you can calculate that Curtis traveled 58 mph.
15 hours = 870 miles
1 hour = 870 ÷ 15 = 58 miles
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Answer: He traveled at 58 miles/hour
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