#include<bits/stdc++.h>
using namespace std;
int main()
{
	int t;
	cin >> t;
	while(t--){
		int m, n;
		cin >> m >> n;
		int arr[m];
		int arr2[m];
		for(int i = 0; i < m; i++){
			cin >> arr[i];
		}
		for(int i = 0; i < m; i++){
			cin >> arr2[i];
		}
		int cnt = 0;
		for(int i = 0; i < m; i++){
			if(n <= arr2[i]){
				cnt++;
			}
		}
		int sum = 0;
		if(cnt > 0){
			for(int i = 0; i < m; i++){
				if(n <= arr2[i]){
					sum += arr2[i];
				}
			}
			cout << sum << endl;
		}
		else {
			cout << "0" << endl;
		}
 
	}
	return 0;
}

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NAoyIDIwCjE1IDY3CjEwIDkwCjMgMQoxIDIgMwoxIDIgMwozIDEwMAoxMCA5MCA1MAozMCA3IDkzCjQgNTAKMTIgNzggNTAgNDAKNDAgMzAgMjAgMTA=

4
2 20
15 67
10 90
3 1
1 2 3
1 2 3
3 100
10 90 50
30 7 93
4 50
12 78 50 40
40 30 20 10