Because there are 24 hours in the day and for some purposes it is simpler not to have to distinguish between morning and afternoon through the use of am and pm.
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12 hour clock we use in our homes.24 hour clock is used in travelling places eg:airport,train station.
A 24 hour clock is better when you are running around the clock operations. Military, Police and Fire Stations use it to avoid any confusion when talking time. Factories that run around the clock, shipping companies, and airlines use it. Answer The Aviation and Space industries use the 24 hour clock as well. It reduces confusion, especially when written or oral communications are critical
12 hour clock but could say the time in a 24 hour clock Analogue describes construction, not hours. It can be either.
2 PM on the 24 hour clock is 14:00.
5.45 or 17.45 (assuming the use of the 24 hour clock system).