#include <iostream>
using namespace std;

int main()
{
    int speed1;
    int speed2;
    int totalspeed;
    int distance1;
    int distance2;
    int totaldistance;
    float velocity ;

    speed1 = 10;
    speed2 = 20;

    distance1 = 100;
    distance2 = 245;

    totaldistance = distance2 - distance1;
    totalspeed = speed2 - speed1;

    Velocity = totaldistance / totalspeed;
    cout<< velocity << endl;
    system("PAUSE");
    return 0;
}