lori recently rode her bike to her friend's house, 8 miles away. On her way back she rode 15mph faster than on her way there. She spent a total of 2 hours biking. What was her average speed each way?

Answer 1

since time = distance/speed,

8/s + 8/(s+15) = 2

So the speeds were 5 and 20 mi/hr

Answer 2

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