Answer:
Time taken by Alex to walk to school is 3/5.
Step-by-step explanation:
[tex]Speed = \frac{Total\ distance\ travelled}{Time}[/tex]
Speed = [tex]3\frac{3}{4}[/tex] = [tex]\frac{15}{4}[/tex]
Total distance travelled = [tex]2\frac{1}{4} =\frac{9}{4} miles[/tex]
Time taken by Alex to walk to school = [tex]\frac{total\ distance\ travelled}{speed}[/tex]
Time taken to walk to school = [tex]\frac{\frac{9}{4} }{\frac{15}{4} } = \frac{9}{4} \times \frac{4}{15} = \frac{3}{5}[/tex]
