Question 876639
D = rt ...Distance equals rate of speed times time.<P>
Truck's speed is x.  Car's speed is x+20.<P>
Truck's time is t.  Car's time is t-2.<P>
For the car:  580 = (t-2)*(x+20)<P>
For the truck:  580 = xt.
For the truck:  x = 580/t.  Plug it into the car equation.<P>
580 = (t-2)* (580/t + 20) = 580+20t - 290/t -40<P>
See image for remainder of calculation.<P>
Car's speed is 1160/9 + 20 = 1160/9 + 180/9 = 1340/9 kph = approximately 148.9 kph<P>
*[illustration ct]