import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

for i in range(ni()):
    n,m,k= na()
    z = m-n
    y = k
    while m >= z:
        y %= m
        m = y
    print(y)
    """a = m%k
    for i in range(n):
        a = a % (m-i-1)
    #print(a)
    if a != y:
        print(n,m,k)
"""