Question

An odinary clock show 12 hours why do railway and airways use 24 hour clock

Answer 1

The railway and airways use 24 hour clock to avoid confusion between AM and PM time for arrival and departure.

Answer 2

12 hrs clock are used in homes and institutions
but in railways and airways they need to know the time as well as is it day or night..
12 0 clock its same but 1 o clock onwards 13, 14, 15 and so on...
Hope my answer is helpful and do hit the like button.