Answer:
12 hours
Step-by-step explanation:
The time intervals between dosages are:
Soup: 4 hours
Zinc lozenges: 6 hours
Aspirin: 2 hours
Nasal spray: 12 hours
To find in how many hours you will take all four medicines again, find the least common multiple to all time intervals:
[tex]LCM\\\\\begin{array}{ccccc}2&4&6&12&|2\\1&2&3&6&|2\\1&1&3&3&|3\\1&1&1&1\end{array} \\\\LCM = 2*2*3=12[/tex]
You will have to take all four medicines again in 12 hours.