A factory that manufactures wooden totems has three products, an intricate North American totem, a minimalist Japanese totem, and a Central African Totem. After 3 months of production, they have the following facts 20 North American, 30 Japanese and 15 Central African totems were produced in the first month. 10 North American, 25 Japanese and 10 Central African totems were produced in the second month. 5 North American, 5 Japanese and 5 Central African totems were produced in the third month. The factory needs to figure out how many hours is used for producing one totem (for each product type). However, they did not record specific data on that. The general manager knows that 285 hours of work time was used for the first month. 185 hours of work time was used for the second month. 95 hours of work time was used for the third month. Prepare a linear system representing this situation, and calculate the time it takes to produce one North American totem. (You may use online calculators for solving your linear systems)