Answer:
1 hour 15 Minutes
Step-by-step explanation:
The glider begins its flight [tex]\dfrac{3}{4}[/tex] mile above the ground.
Distance above the ground after 45 minutes =[tex]\frac{3}{10} \:mile[/tex]
Change in height of the glider
[tex]=\frac{3}{4}-\frac{3}{10} \\\\=\frac{15-6}{20}\\\\=\frac{9}{20} miles[/tex]
Next, we determine how long the entire descent last.
Expressing the distance moved as a ratio of time taken
[tex]\frac{9}{20} \:miles : 45 \:minutes\\\\\frac{3}{10}\:miles:x \:minutes\\\\x=45X\frac{3}{10}\div\frac{9}{20} =30 Minutes[/tex]
Therefore: Total Time taken =45+30=75 Minutes
=1 hour 15 Minutes
