Question

quantos minutos correspondem a 2 1/4 horas

Answer 1

2 horas = 120 minutos; 60 minutos/4 = 15; Logo 2 1/4 = 135 minutos!

Answer 2

$\large\begin{array}{l} \texttt{Sabemos que}\\\\ \mathtt{1~h=60~min}\\\\\\ \texttt{Logo,}\\\\ \mathtt{2\,\dfrac{1}{4}~h}\\\\ =\mathtt{\left(2+\dfrac{1}{4}\right)~h}\\\\ =\mathtt{\left(\dfrac{4\cdot 2}{4}+\dfrac{1}{4}\right)~h}\\\\ =\mathtt{\left(\dfrac{8}{4}+\dfrac{1}{4}\right)~h}\\\\ =\mathtt{\dfrac{8+1}{4}~h}\\\\ =\mathtt{\dfrac{9}{4}~h} \end{array}$

$\large\begin{array}{l} =\mathtt{\dfrac{9}{4}\cdot (60~min)}\\\\ =\mathtt{9\cdot 60:4~min}\\\\ =\mathtt{9\cdot 15~min}\\\\ =\boxed{\begin{array}{c}\mathtt{135~min} \end{array}}\qquad\checkmark \end{array}$


$\large\begin{array}{l} \texttt{D\'uvidas? Comente.}\\\\ \texttt{Bons estudos!} \end{array}$