A. One car comes and one car goes
Two cars from the East Station and the west Station started to drive toward each other, and they met 60 miles away from the East Station first. Both of them kept their original speed until reached the other station, then they returned immediately. At a distance of 30 miles from the West Station they met the second time. Calculate the distance between two stations.
Output
Output one number, the answer.
Your answer will be considered as correct if the relative or absolute error is less than 10^{-4}10
−4
.小学奥数题：抓住时间不变
列俩公式即可：S = 60 / y (x + y)
2S = (S - 30) / y (x + y)
#include <iostream>
using namespace std;
int main()
{
cout<<150<<endl;
return 0;
}