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Marina can bicycle 19.5 miles in the same time it takes her to run 6 miles. She bikes 9 miles per hour faster than she runs. At what speed does Marina run?

Verified Answer :

meerkat18

To answer the question, let x be Marina's speed running. With this representation, Marina's speed biking is x + 9. Time is calculated by dividing distance by time. 
                                 19.5 / (x + 9) = 6 / x
The value of x is approximately  4.    . Therefore, Marina can run at a speed of 4 miles per hour.

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A on edge

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