Solve.

{d+e=2

d-e=4

Use the substitution method.

There are an infinite number of solutions.

The solution is (3, - 1).

The solution is (5, 1).

There is no solution.

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Mikaela is competing in a race in which she both runs and rides a bicycle. She runs 5 kilometers in 0.5 hour and rides her bicycle 20 kilometers in 0.8 hour. At the rate given, how many kilometers can Mikaela run in 1 hour?

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115 and 125 as a decimal