U just need to find the LCM so I believe it would be 24 hours. So it could be just 9:30 again? Or just count up like 1,2,3... until u hit a number that is divisible of 8 and 6 then add that to 9:30
I'm assuming you meant express 4/5 as a percent and not 4/5%. So simply evaluate 4/5 to get 0.80. Now multiply this value by 100 to get the percentage which gives you 80%