YOU HAVE NOT COMPLETED THE QUESTION but if the question is as follows

Jamie drove to visit her parents who live 600 miles away on her waY THERe her average speed was 20 mph faster than on her way home. if jamie spent a total of 25 hours driving find the two rates

Let Jamie's speed be x. Her speed on the way home was x+20. Thus: -------------------- 600/x+600/(x+20)=25 Multiply each side by (x)(x+20): 600(x+20)+600x=25(x2+20x)

1200x+12000=25x2+500x 0=25x2-700x-12000 0=x2-28x-480 0=(x+12)(x-40) x=-12,40 ------------------ Throwing out the negative result, we get her speed going there to be 40mph, and 60mph to be her speed coming back.

Sep 26th, 2014

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