# 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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3. 18
1. 18 mph = 28.9682 km per hour

212/28.9682 = _______ hours

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posted by Ms. Sue
2. 7.32 Hours

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posted by Rebecca

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