Question 1002095
I will set it up and you finish. 
Let x = the time it will take for the cars to collide. 
The cars are 170.2 feet from each other. 
This means they are the same distance apart. 
Distance 1 + Distance 2 = 170.2 feet 
27x + 52x = 170.2 feet 
Solve for x and your done.