import sys
#input = sys.stdin.readline
input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
#import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
MOD = pow(10,9) + 7
#MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]


def main():
    N = int(input())
    for _ in range(N):
        T,m,L = map(float,input().split())
        v_ms = (100*m*m*T*T + 20*m*L)**(0.5) - 10*m*T
        ans = v_ms * 3.6
        # print(ans)
        ans_int, ans_syou = str(ans).split('.')
        if len(ans_syou) >= 2:
            ans = ans_int + "." + ans_syou[:2]
        else:
            while len(ans_syou) < 2:
                ans_syou += '0'
            ans = ans_int + "." + ans_syou
        print(ans)

if __name__ == '__main__':
    main()