Covid-19 Pandemic

Ellice and Zia will write research on the COVID-19 pandemic. Ellice spends 2 2/4 hours, and Zia spends 3 ½ hours. How long does it take them to conduct the research for their projects?

Correct answer:

x =  6 h

Step-by-step explanation:

$$\begin{gathered} E=2\frac{2}{4}=2+\frac{2}{4}=\frac{2\cdot 4+2}{4}=\frac{8+2}{4}=\frac{10}{4}=\frac{5}{2}=2.5\text{h} \\ Z=3\frac{1}{2}=3+\frac{1}{2}=\frac{3\cdot 2+1}{2}=\frac{6+1}{2}=\frac{7}{2}=3.5\text{h} \\ x=E+Z=\frac{5}{2}+\frac{7}{2}=\frac{5+7}{2}=\frac{12}{2}=6\text{h} \end{gathered}$$

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