# Getting Fit

Algebra Level 3

As part of his daily exercise, Calvin takes a walk a fixed course. He generally does so at the same speed. On a day that he's feeling energetic, he walks $$2$$ km/hr faster than normal, and found that it took half the usual time plus $$15$$ minutes to finish the course. On a day that he's feeling lethargic, he walks $$1$$ km/hr slower than normal, and found that it takes $$30$$ minutes more than the normal time. What is the distance (in km) of the course that he walks everyday?

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