Question 19517
Assuming the cars  start from the same starting point

Assuming the the cars are travling in the same direction 

 distance between the to cars 
= 65x - 55(x+2)
= 65x - 55x - 110
= 10x - 110

if the distance come out to be negative then the care with speed 65MPH is still behind the 55MPH care if it is positive then the case is other way round


Assuming the the cars are travling in the same direction 

 distance between the to cars (will be positive)
= 65x + 55(x+2)
= 65x + 55x + 110
= 110x + 110

Assuming the the cars are travling at 90degrees to each 

then the distance between them 
= (65x^2 + (55(x+2))^2) ^ 1/2


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