Ashley can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?

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  1. Let x = bike speed and x+12 = car speed. Since they both go the same distance:

    2/3x = 1/3(x+12)

    Solve for x.

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