#print(f"{decimal.Decimal('8.354') / 1000000:.50f}")
from decimal import *
import decimal
import math
context = Context(prec=1000)
setcontext(context)
t=int(input())
for i in range (t):
  r1, r2, r3 = map(Decimal, input().split())
  r4=decimal.Decimal(r1+r2)/decimal.Decimal(r3)
  print(f"{decimal.Decimal(r4)-(decimal.Decimal(r4)%decimal.Decimal(0.00000000000000000000000000000000000000000000000001)):.50f}")