Question 911252

r the car's speed
t = D/r, times equal the question states
{{{315/(r-5) = 360/r}}}
315r = 360r - 1800
1800 = 45r
40mph = r, the car's speed.  the truck 35mph{{{40-5}}}
and checking...
{{{315/35 = 360/40}}}