Question 765852
Let r = speed of slower car.
Know that the faster car goes at speed, r+5.


CAR__________speed___________time___________distance
SLOW__________r______________2______________r*2
FAST__________r+5____________2______________(r+5)*2
Total_______________________________________170


Helpful Comments:
Total does not apply to speed.
Total does NOT apply to time.
Total works for the sum of the distances each car traveled during the two hour period.
The asterisk,  *, is used for indicating multiplication.


EQUATION FOR SITUATION:
{{{highlight(r*2+(r+5)*2=170)}}}
Solve the equation for r.