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The diameter of each tire on Niki's bike is 66 centimeters (cm). It takes her 16 minutes to ride 10 kilometers (km).

How fast did Niki ride, in kilometers per hour?

  • math -

    Let's use a proportion. Cross multiply and solve for x.

    16/10 = 60/x

    16x = 600

    x = 600/16

    x = 37.5 km/h

  • math -


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