简单的物理问题，x = pt, y = l - qt。令x == y解出t，然后得出相遇位置。
#include<bits/stdc++.h> using namespace std; typedef long long ll; //#define LOCAL int main() { #ifdef LOCAL freopen("in.txt","r",stdin); #endif int l, p, q; scanf("%d%d%d",&l,&p,&q); double ans = (double)l/(p+q)*p; printf("%lf",ans); return 0; }
Codeforces Round #327 (Div. 2) A Wizards' Duel
原文：http://www.cnblogs.com/jerryRey/p/4909914.html