SOLUTION: Solve. Mark drove 150 miles to visit Sandra. Returning by a shorten route, he found that the trip was only 130 miles, but traffic slowed his speed by 6 miles. If the two trips t

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Question 124522: Solve.
Mark drove 150 miles to visit Sandra. Returning by a shorten route, he found that the trip was only 130 miles, but traffic slowed his speed by 6 miles. If the two trips took exactly the same time, what was his rate on the return trip?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
time equals distance divided by rate __ times are equal __ let x="return rate"

150/(x+6)=130/x

"cross" multiplying __ 150x=130x+780 __ 20x=780