import sys
input = sys.stdin.readline

def f(T, m, L, V):
    V *= 10
    return 36 * V * 20 * m * T * 100 + V * V * 10000 <= 36 * 36 * L * 20 * m * 10000

N = int(input())
for _ in range(N):
    T, m, L = input().split()
    a, b = T.split(".")
    T = int(a + b)
    a, b = m.split(".")
    m = int(a + b)
    a, b = L.split(".")
    L = int(a + b)
    yes = 0
    no = 10 ** 18
    while abs(yes - no) != 1:
        mid = (yes + no)//2
        if f(T, m, L, mid):
            yes = mid
        else:
            no = mid
    low = yes % 100
    yes //= 100
    print("{0}.{1}".format(yes, str(low).zfill(2)))