#include <stdio.h>
#include <stdlib.h>

int main()
{
    int numeroTestes, numX, numY;
    scanf("%d", &numeroTestes);
    for(int i = 1; i <= numeroTestes; i++){
        scanf("%d %d", &numX, &numY);
        if(numY == 0){
            printf("divisao impossivel\n");
        }else{
            printf("%.1f", (float)numX/(float)numY);
        }
    }
    return 0;
}