C/C++ :: Converting Miles Per Hour To Seconds Per Mile

I have to program something that would convert miles per hour to seconds per mile.

I'm having an issue with something that I coded. Lines 21-23 are not showing up when I compile the program. What I'm trying to do is convert seconds into minutes.

What I have so far is

#include <iostream>
using namespace std;
int main() {
double miles_per_hour, minutes_per_hour, seconds_per_hour, seconds, minutes;
cout << "Enter the miles per hour: ";
cin >> miles_per_hour;

[Code] ....