It's not possible. it lasts longer in your system than anything else out there.
No. Caveat Emptor.
Let's see . . . -- "Three tenths" is less than one. -- "Twenty-four and etc." is more than twenty-four. The first one looks like less. The second one looks like more.
21.2
4 - 24 = -20
Eighteen hours is less than twenty four, which is the length of one earth day. Eighteen hours is three-quarters of one earth day.
nine hours less twenty is what is literally means, guessing though they meant less than twenty nine hours.
23.9
Four tenths is less than four hundred twenty-five thousandths. 4/10 < 425/1000 0.400 < 0.425
twelve
You calculate 24.020 - 0.3
24.20-0.3 is 23.9
Earth takes a bit less than 24 hours to complete one rotation (day). The day on Mars is a bit longer at 24.6 Earth hours.