Question

A glider begins its flight 3/4 mile above the ground. After 45 minutes, it is 3/10 mile above the ground. Find the change in height of the glider. If it continues to descend at this rate, how long does the entire descent last?

Answer 1

Answer:

1 hour 15 Minutes

Step-by-step explanation:

The glider begins its flight $\dfrac{3}{4}$ mile above the ground.

Distance above the ground after 45 minutes =$\frac{3}{10} \:mile$

Change in height of the glider

$=\frac{3}{4}-\frac{3}{10} \\\\=\frac{15-6}{20}\\\\=\frac{9}{20} miles$

Next, we determine how long the entire descent last.

Expressing the distance moved as a ratio of time taken

$\frac{9}{20} \:miles : 45 \:minutes\\\\\frac{3}{10}\:miles:x \:minutes\\\\x=45X\frac{3}{10}\div\frac{9}{20} =30 Minutes$

Therefore: Total Time taken =45+30=75 Minutes

=1 hour 15 Minutes