[kangaroo](https://www.hackerrank.com/challenges/kangaroo)

gistfile1.txt

function main() {
    var x1_temp = readLine().split(' ');
    var x1 = parseInt(x1_temp[0]);
    var v1 = parseInt(x1_temp[1]);
    var x2 = parseInt(x1_temp[2]);
    var v2 = parseInt(x1_temp[3]);
    var n = (x2-x1)/(v1-v2);
    if(Number.isInteger(n) && n>0){
        console.log("YES");
    }else{
        console.log("NO");
    }
}