# Math

A cyclist rides his bike at a speed of 27 miles per hour. What is this speed in feet per second? How many feet will the cyclist travel in 15 seconds? In your computations, use the fact that 1 mile is equal to 5280 feet. Do not round your answers.

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1. 27mi/hr * 5280ft/mi * 1hr/3600s = ? ft/s

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posted by Steve
2. Im. Sorry but I still don't get it?

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posted by Jalen
3. / means divide
* means multiply

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4. No. Im not understanding what to do with the 3 numbers or how u got them.?

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posted by Jalen
5. you have mi/hr
You want ft/s

1 hour = 3600 seconds
1 mile = 5280 feet

So,
1mi/hr = 5280 ft/hr
= 5280ft/3600s = 5280/3600 ft/s

your speed is 27 mi/hr, so that is

27*5280/3600 = 29.6 ft/s

You can always multiply by 1 without changing anything. Since

1 mi = 5280 ft, that means that

5280ft/1mi = 1

You line up the ratios so that the units cancel, just like factors of a number.

3*2/2*7 = 2/7
the 2's cancel

27mi/hr * 5280ft/mi = 27*5280 ft/hr
the "mi" units (factors) cancel

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posted by Steve

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