if the entire history of earth (4.5 billion yrs old) was equivalant 24 hours?

Question

at whaty time would dinosuars have dinosuars existed

*****at what would have dinosuars existed*****

Answer 1

10:45 - 11:00 pm

If the history of the Earth were compressed into a single 24 hour day, the formation of the planet took place at 12:00 midnight. The first rocks didn’t solidify in the ancient crust of the Earth until about 2:45 or 3:00 am. This first prokaryotes came into being at somewhere between 3:15 and 4:00 in the morning. Oxygen accumulated in the atmosphere more than 8 hours later, by about 12:30 pm. The first eukaryotes appears shortly thereafter, at between 1:30 and 2:30 pm. The first multicellular organisms didn’t appear until much later, at between 6 and 6:30 pm and the first animals didn’t make their appearance until about 6:30 or 7:00 pm. The invasion of solid ground didn’t take place until late in the day, at about 9:45 pm. Mammals and dinosaurs made their appearance at between 10:45 and 11:00 pm, but the dinosaurs suddenly went extinct shortly after the first flowers bloomed, at about 11:30 pm. Finally, our direct ancestors made their debut toward the end of the day at 11:59 and 40 seconds! That’s right, humans have only been walking the Earth for the last "20 seconds" of the whole "day" of Earth’s history!

Answer 2

The first thing you would have to figure out is what portion of 4.5 billion years ago is 65 million the point of extinction. See below link.
There is 1000 million in a billion so 65 million is approximately 2/3 of a billion.
I'M WAY OUT ON A LIMB HERE, THIS AMOUNT IS TREACHEROUS UNLESS YOU EXCELL IN ANY OF THE MATHS.
4.5 BILLION / 3= 1.5 BILLION
OR 1/3 OF 24 HRS= 8 HRS into the 24.
....8/24
Someone like my granddaughter who teaches calculus in high school needs to answer this.
I made a stab at it!
Dinosaurs as a group got bigger over time until an extinction event 65 million years ago wiped out all but bird-like dinosaurs. Scientists don't agree entirely on what happened, but the extinction likely was a double or triple whammy involving an asteroid impact, choking chemicals from erupting volcanoes, climate change and possibly other factors.
http://www.livescience.com/animals/051201_dinosaur_history.html

Answer 3

Take 100 million years as the ballpark figure for how long ago dinos existed.

(4.4 / 4.5) x 24 = 23.46, or 23:28

Proto-humans appeared roughly a million years ago. Their appearance would have been at

(4.499 / 4.5) x 24 = 23.9947 or 23:59:41, or 19 seconds before midnight.

Answer 4

22nd hour 42nd minute approx*