$\"\"$

Speed of the object in kilometer per hour is $\"\"$ , where

$\"\"$ represents speed of the object in miles per hour.

(a).

The function is $\"\"$ .

To find the inverse of the function, solve $\"\"$ in terms of $\"\"$ .

$\"\"$

Now interchange $\"\"$ and $\"\"$ .

$\"\"$

Replace

$\"\"$

The inverse of $\"\"$ is

$\"\"$

The inverse fumction is $\"\"$ .

$\"\"$ represents speed of the object in miles per hour.

$\"\"$ represents speed of the object in kilometer per hour.

$\"\"$

(b).

Graph:

Graph for the functions $\"\"$ and $\"\"$ .

$\"\"$ .