Problem 9

$$\begin{array}{lcl} 9.\:A\:runner\:complete\:one\:lap\:of\:a\:track\:in\:48\:seconds.\\ How\:many\:minutes\:will\:it\:take\:him\:to\:run\:50\:laps\:at\\ the\:same\:speed\:?\\ \\ (A)\:23\:minutes\\ \\ (B)\:48\:minutes\\ \\ (C)\:40\:minutes\\ \\ (D)\:36\:minutes\\ \\ (E)\:30\:minutes\\ \end{array}$$