4:30PM
First divide 480 by 60 then you get the answer of 8 that is the the amount if hours extra to 8:00 you need to add on then the train stops for half an hour so you have to add that on to get
4:30pm
3 half-lives because 200/2=100 100/2=50 and 50/2=25
A = 6%
B = 36%
C = 16/25
D = 80%
M = 11/50
R = 45%
T = 14/25
X = 7/10
Those are all the answers that I got, I’m NOT saying all of them are correct! I hope this helps tho- :)