#include <stdio.h> #include <iostream> #include <string.h> #include <string> #include <algorithm> #include <iomanip> using namespace std; int main() { int n, v1, v2, t; float time; while (cin >> n >> v1 >> v2>>t) { int v = v1 - v2; if (v <= 0) { cout << "NO"<<endl; } else { time = n * 1000.0 / v; if (time <= t) { cout <<fixed<<setprecision(2) <<time << endl; } else { cout << "NO" << endl; } } } } |
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