from sys import stdin
input = stdin.readline

for _ in range(int(input())):
    N, M, K = map(int, input().split())

    ans1, ans2 = 0, 0
    cnt = (K+M-1)//M
    ans1 = (N-cnt)/N/M
    now = 1
    cnt = K-(N-1)*M-1
    ans2 = (M-1)/M
    if 1 <= cnt:
        ans2 *= (M-1-cnt)/(M-1)

    print(ans1+ans2)