Question 452586
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..