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#include<stdio.h>
int main() {
	int T,V,K,S,E,sum;
	int i;
	while(~scanf("%d",&T)) {
		while(T--) {
			scanf("%d %d %d %d",&V,&K,&S,&E);
			S=(S-1)/K;
			E=E/K;
			sum=E-S;
			if(sum>V)
				printf("%d\n",V);
			else
				printf("%d\n",sum);
		}
	}
	return 0;
}