why are there only 60 seconds in a minute??

It relates all to history. The time sections are based off of the ancient babylonian number system, which is in base 60. The babylonians also set their time that way because it is in their culture and belief system. So, come time to decide our own time system, the "experts" said "well, the babylonians used it and it works for them, so we'll copy them and it'll work for us." And that is why there are 60 seconds in a minute and 60 minutes in an hour and 24 hours in a day.

you are asking for something without almost an answer...like why is the grass green?? or why doesnt water have a color?? why isnt it yellow orange