import sys
input = sys.stdin.readline

N = int(input())
for _ in range(N):
    T, m, L = map(float, input().split())
    v = ((10*m*T)**2+20*m*L)**0.5 - 10*m*T
    v *= 3.6
    v = int(v*100)/100
    print(f"{v:0.2f}")