Help me in solving FLOW016 problem

help
,
1

My issue

My code

/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t-->0){
		    int a = sc.nextInt();
		    int b = sc.nextInt();
		    int gcd = gcd(a,b);
		    int lcm = b/gcd * a;
		    System.out.println(gcd + " " + lcm);
		}
	}
	
	private static int gcd(int a,int b){
	    if(a%b==0){
	        return b;
	    }
	    return gcd(b, a%b);
	}
}

Problem Link: FLOW016 Problem - CodeChef