from sys import stdout
import os
import io
 
input = io.BytesIO(os.read(0, \
     os.fstat(0).st_size)).readline
 
n: int = int(input())
 
while n:
	n -= 1
 
	line = input().decode()
 
	distance, time = line.strip().split()
	meters = float(distance)
	h, m, s = [float(i) for i in time.split(":")]
 
	seconds = s
	seconds += m * 60.0
	seconds += h * 60.0 * 60.0
 
	kilometers = meters/1000
	result = seconds/kilometers
	diff = float(result - round(result))
 
	if diff >= 0.5:
		result = round(result) + 1
	else:
		result = round(result)
 
	m, s = divmod(result, 60)
 
	stdout.write(f"{m}:{s:02d}\n")

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MwoxMjAwIDAwOjA2OjA5CjYwMDAgMDA6MzA6MDIKMTAwMDAgMDA6NTU6MDU=

3
1200 00:06:09
6000 00:30:02
10000 00:55:05