Let the car meet the truck after x minutes.
Speed of car 75 mph = 75/60 miles per minutes. Thus distance traveled by car = 75/60 x minutes
Similarly distance travelled by the truck = 60/60 ( x + 8 ) minutes
But both have traveled the same distance.
Thus 75/60 x=60/(60 )(x+8 )
75x=60x + 8x60
15x = 8 x 60 OR x = 32
Thus the car will overtake the truck after 32 minutes