Chemistry Dimensional analysis

A cyclist rides at an average speed of 18 miles per hour. if she wants to bike 212km, how long in hours must she ride?

What I have so far..

212km(10^3 miles

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  2. 0
  3. 18
asked by Joey
  1. 18 mph = 28.9682 km per hour

    212/28.9682 = _______ hours

    1. 0
    2. 0
    posted by Ms. Sue
  2. 7.32 Hours

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    2. 0
    posted by Rebecca

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