In maths 8 plus 6 is 14 but when we count from 8 to 6 in clocks it comes out to be 10 hours. Why?

Because clocks go from 1 to 12 and then start over. We work on base 10, so we start counting over at 1 sooner. So from 8 to 12 is 4 hours. Then from 12 to 6 is 6 hours. 4 hours + 6 hours is 10 hours. The 2 on the clock is 14 on a 24 hour clock, and that is 6 hours after 8.