SOLUTION: Duncan traveled to a city 190 miles from his home to attend a meeting. Due to car trouble, his average speed returning was 12 mph less than his speed going. If the total time fo

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Question 1080467: Duncan traveled to a city 190 miles from his home to attend a meeting. Due to car trouble, his average speed returning was 12 mph less than his speed going. If the total time for the round trip was 7 hours, at what rate of speed did he travel to the city?
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
            SPEED        TIME        DISTANCE

GOING          r          190/r       190

RETURN        r-12        190/(r-12)  190

TOTAL                       7


Solve the equation for sum of times, 190%2Fr%2B190%2F%28r-12%29=7.