Suppose the Velocity of an Automobile Starting from Rest Is $$\mathrm{v}=\frac{200 \mathrm{t}}{2 \mathrm{t}+10}$$

Multiple Choice

Suppose the velocity of an automobile starting from rest is given by
$$\mathrm{v}=\frac{200 \mathrm{t}}{2 \mathrm{t}+10}$$
Where $v$ is the velocity in miles per hour and $t$ is the time in seconds. Find the number of seconds when the velocity is 50 miles per hour.

A) $6 \mathrm{sec}$
B) $5 \mathrm{sec}$
C) $7 \mathrm{sec}$
D) $2.5 \mathrm{sec}$