Let's begin by listing out the information given to us:
Total Time = 3 1/4 hours
Time travelled already = 1/5 of total time
[tex]\begin{gathered} \frac{1}{5}\cdot3\frac{1}{4}=\frac{1}{5}\cdot\frac{13}{4}=\text{ }\frac{13}{20}\text{ hour } \\ \\ OR \\ \\ \frac{13}{20}\cdot60=39\text{ minutes} \end{gathered}[/tex]How much longer will it take to complete trip is calculated by the difference between Total Time & Time travelled already
[tex]\begin{gathered} 3\frac{1}{4}-\frac{13}{20}=\frac{13}{4}-\frac{13}{20}=\text{ }\frac{52}{20}=\frac{13}{5}=2\frac{3}{5}\text{ hours} \\ \\ OR \\ \\ \frac{13}{5}\cdot60=156\text{ minutes} \end{gathered}[/tex]
