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OpenStudy (anonymous):
Increasing the average speed of a car by 12 mph results in a 189 mile trip taking an hour less than before. What was the original average speed of the car?
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OpenStudy (anonymous):
46 I think
OpenStudy (anonymous):
how?
OpenStudy (anonymous):
189/x=189/(x+12)+1 189(x+12)=189(x)+x2+12x 189x+2268=189x+x2+12x x2+12x-2268=0 (x+58)(x-46)=0 x=46 or -58 Throwing out the negative answer, we get the original speed of the car to be 46 mph..
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