20,000 pounds is equals 10 tons.

It's 24 hour time instead of 12 hour time. It goes from 1 a.m. and once you to 12 p.m then 1 would be 13 and then
2 - 14
3 - 15
4 - 16
5 - 17
6 - 18
7 - 19
8 - 20
9 - 21
10 - 22
11 - 23
12 - 24

Then it would start back over at one again.
The answer would be 5: 13 P.M

Both petroleum and coal are made up of complex of carbon-based molecules, in bold originated with living creatures of some kind. Both are vital source of energy for the modern world and both were formed by geologic process over a million years. However, petroleum was mainly formed from the remains of ocean-dwelling micro organisms. Coal, on the other hand, originated from decayed vegetation and adjacent swamps and bogs. In any case, it took millions of years for both polar and oil to be produced. This is the case between it took that much time for overlying sediments to produce the unimaginable heat and pressure that would one day allow us to harvest these energy resources. The 1 clue word or phrase in the passage that indicates a contrast is the word "However."