SOLUTION: One car travels 50 miles per hour and another travels 55 miles per hour. If they start from the same place at the same time and travel in the same direction, after how many hours w

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55*t - 50*t = 35     (distance by the 1-st car - distance by the 2-nd car = 35)


(55-50)*t = 35


5*t 35


t =  = 7.


Answer.  After 7 hours.