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Sagot :
[tex]3\ min\ ----->\frac45\\x\ min\ ----->1\\x\ \cdot\
\frac45=1\cdot3\\\frac45x=3\ /\ : \frac45\\x=3\ :\ \frac45\\x=\frac31\
\cdot\ \frac54\\x=\frac{15}{4}\\x=3\frac34\ [min]\\x=3\ min\ 45\
sec[/tex]
answer: 3 min 45 sec
answer: 3 min 45 sec
[tex]3\ min - \frac45\\
x\ min - 1\\
\\
3=\frac45 x\ /:\frac45\\
\frac{3}{\frac45}=x\\
x=3\cdot \frac54=\frac{15}4=3\frac34\ min=3\ min\ 45\ s[/tex]
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