Book Maths Puzzle Algebra

What is the answer of 10 to the 2nd power?

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Solve for x, [4x/(x^2+x+3)]+[5x/(x^2-5x+3)]=(-3)/2 A deer is standing 80m in from the west end of a tunnel. The deer sees a train approaching from the west at a constant speed ten times the speed the deer can run. The deer reacts by running toward the train and clears the exit when the train is 20m from the tunnel. If the deer ran in the opposite direction it would be hit by the train at the Eastern entrance. How long is the tunnel?