The police are chasing a bank robber.While driving at 50m/s,they fire a bullet to shoot out a tire of his car.The police gun shoots bullets at 300m/s.What is the bullet's speed as measured by a TV camera crew parked beside the road?

Question

$\begin{array}{1 1}350m/s\\450m/s\\250m/s\\150m/s\end{array}$