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Helena is watching a movie ontelevision. She notices that there are9. min of commercials for every hof the movie.What is the unit rate of minutes of commercials per hour of the movie?

Helena is watching a movie ontelevision. She notices that there are9. min of commercials-example-1
User CLearner
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1 Answer

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unit\text{ rate = = 18 }(1)/(2)(\min s)/(hr)\text{ (option D)}

Step-by-step explanation:


9(1)/(4)\text{minutes of commercial = }(1)/(2)\text{hour of Television}

A unit rate of minutes of commercials per hour of the movie means to find minute of commercial in 1 hour:


\begin{gathered} (1)/(2)\text{hour = 9}(1)/(4)\min \\ 1\text{ hour = x} \\ \text{cross multiply: } \\ x((1)/(2))\text{ = 1(9}(1)/(4)) \\ \frac{x}{2\text{ }}=\text{ }(37)/(4)\text{ cross multiply} \\ 4x\text{ = 2}*37 \\ x\text{ = }(74)/(4)\text{ = }(37)/(2) \\ x\text{ = 18 }(1)/(2) \end{gathered}

The unit rate of minutes of commercials per hour of the movie = 18 1/2 (option D)

User Iyad Al Aqel
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