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A plane flew 525 miles in 1.75 hours. Find the average speed of the plane.

User Zoliqa
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We are trying to find the average speed of the plane, which is mph, or
\frac{\textrm{miles}}{\textrm{hour}}. Using proportions, we can find the average speed of the plane in mph:


\frac{525 \,\, \textrm{miles}}{1.75 \,\,\textrm{hours}} = \frac{x \,\, \textrm{miles}}{1 \,\,\textrm{hour}}

  • Use the information from the problem to create a proportion. Remember that we are looking for mph, so we will call that
    x.


(525)/(1.75) \,\textrm{miles} = x \,\textrm{miles}

  • Multiply the entire equation by
    1 \,\textrm{hour}


(525)/(1.75) = 300 = x

  • Divide both sides of the equation by
    1 \,\textrm{mile} to clear both sides of the mile unit

The average speed of the plane is 300 mph.

User Tarik
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