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Slow and steady wins the race. The leatherback sea turtle is the fastest known reptile, with a maximum speed of $21$.$92$ miles per hour ( $\mathrm{mph})$.$\newline$Which of the following equations, where $d$ is distance in miles and $t$ is time in hours, represents a speed that is less than that of the leatherback sea turtle?$\newline$Choose all answers that apply:$\newline$(A) $d=2.192 t$$\newline$(B) $d=20 t$$\newline$(C) $d=22 t$$\newline$(D) $d=30 t$