Problem 2. Show work. (6 pts) In 1890 in the UK, 200 Mt of coal were produced. Now suppose that that the same quantity (200 Mt) was again produced in 1960. The amount produced during the year of maximum production rate was 250 Mt. In what year (or years) was the production rate 225 Mt/yr? One Mt = 1 megatonne. Assume that coal production in the UK follows Hubbert's model