Solve the Problem $73 \mathrm{~km} / \mathrm{hr}$ Express This Speed in Miles Per Hour

Multiple Choice

Solve the problem. Round to the nearest tenth if necessary.
-Mustaf flew his helicopter at a speed of $73 \mathrm{~km} / \mathrm{hr}$ . Express this speed in miles per hour.

A) $4.6 \mathrm{mi} / \mathrm{hr}$
B) $45.6 \mathrm{mi} / \mathrm{hr}$
C) $1168 \mathrm{mi} / \mathrm{hr}$
D) $116.8 \mathrm{mi} / \mathrm{hr}$