Solution
The average number of beats per second is calculated as;
[tex]\begin{gathered} film1=\frac{24}{\frac{1}{8}}=192\text{ beats/sec} \\ \\ film2=\frac{30}{\frac{1}{6}}=180\text{ beats/sec} \\ \\ film3=\frac{18}{\frac{1}{12}}=234\text{ beats/sec} \\ \\ \text{ hence, average number of beats per second is}=\frac{192+180+234}{3}=\frac{606}{3}=202\text{ beats/sec} \end{gathered}[/tex]
