A noob needs his code checked

Hey I'm and electrical engineering student so programming is not my forté. I was wondering if someone could check over my code, the purpose is to turn on a red led if a car goes faster than 120 km/h by using two sensors 30m apart.

Here is the link to my code  http://pastebin.com/7dJeKLqh

Thanks for the help!

Ok I made some changes to my code here is the new version. http://db.tt/4HQr92i

Oh and ps. I didn't know not to put void infront of main, my professor told me to do it that way