def main():
    n, m, k = list(map(int, input().split()))
    if (n-1) * m < k:
        k = k - (n-1) * m
        return k / m
    else:
        t = (k + m - 1) // m
        return 1 - t / n / m

for _ in range(int(input())):
    print(main())