It is 2.
If the points are (0, 0) and (2, 4) then the slope works out as 2
If you mean: (0, 0) and (2, 4) then the slope works out as 2
If you mean: (0, 0) and (6, 7) then the slope works out as 7/6
If you mean: (0, 0) and (6, 7) then the slope works out as 7/6
Your answer is 3/24 or 0.125 Slope = Rise / Run
Midnight is represented as: 00:00 on a 24 hour clock.
4x+2y=24 => 2y=24-4x => y=12-2x and the slope is -2
9:00 pm on a 12-hour clock is equivalent to 21:00 on a 24-hour clock.
16:00 is 4pm on a 24 hour clock.
The slope is 5.
2 PM on the 24 hour clock is 14:00.
Presumably by 2400 you mean 24:00 as the time. There is no time 24:00 as a minute after 23:59 would normally be written as 00:00, which would be midnight.