using function for MPH

Im new to functions and im not sure why I cant get this to run?? any help would be greatly appreciated! :)
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#include<iostream>
using namespace std;

void f(int &, int &, double);
void f(int & miles, int & hours, double milesPerHour)
{
	milesPerHour = miles / hours;
}

{
	int main()
	{
		cout << "Please enter the miles traveled" <<endl;
		cin >> miles;
		cout << "Please enter the hours traveled" <<endl;
		cin >> hours;
		cout << setprecsion(2) << fixed;
		cout << "your speed is " << f(miles, hours) << " miles per hour" <<endl;

		system("pause");
		return 0;
	}
miles and hours aren't declared anywhere.
so should I enter them as an integer in the main?
I figured it out, Thank you!
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