Book Maths Puzzle Algebra

There are 850 Douglas fir and ponderosa pine trees in a section of forest bought by Sawz Logging Co. The company paid an average of $300 for each Douglas fir and $225 for each ponderosa pine. If the company paid $217,500 for the trees, how may of each kind did the company buy?

How do I solve when I have two factors?

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Book Other Question

I am not sure how to find either of the unknowns in this equation. Either that or I am missing something that is known. A bank robber robs a bank and speeds away on the freeway at 80 miles/hour. Thirty minutes later police officers take off in pursuit at 90 miles/hour. How long will the police have to drive to catch up and how far from the bank will they catch the robbers? Solve for the variables 'a' & 'b' (only the positive solutions) where, (a-b) x (a+b) = 9 x 5.