Arthur D. answered 10/12/14
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45 feet/6 feet=7.5 minutes to cross the street
7.5*60 seconds=450 seconds
another way to look at the problem...
6 feet per minute=6 feet per 60 seconds
6 feet per 60 seconds= 1 foot per 10 seconds
the turtle travels 1 foot every 10 seconds
to travel 45 feet it would take the turtle 45*10=450 seconds