![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
(a)
\Observe the graph of runner A and runner B.
\Notice that runner A runs at constant speed and runner B starts running
\slowly and gradually increases his speed until the race is finished.
\\
![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
(b)
\Observe the graph of runner A and runner B.
\It is observed that after 8 seconds the distance between the runners is maximum,
\which is more than 25 meters.
\The distance between the runners is maximum after 8 seconds.
\ ![\"\"](\"/userfiles/image/steps_images/step3.JPG\")
(c)
\Observe the graph of runner A and runner B.
\The Runner B has same speed to Runner A, when the tangent both the curve is parallel to each other.
\The tangent line to the curve B is parallel to the line A at approximately 9 seconds.
\Therefore the runners have same velocity at 9 seconds.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
(a)
\Runner A runs at constant speed.
\Runner B starts running slowly and gradually increases.
\(b)
\The distance between the runners is maximum after ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=596dbfdc822a43adb27d19f5c360ac2a.png\")
seconds.
(c)
\The runners have same velocity at 9 seconds.