how do you find the speed of the bullet from this im confused

FBI Firearm Expert Lorenzo Nofingers has provided you with the following table showing estimated muzzle velocities based on the firearms confiscated from the suspects. Investigators on the scene determined that it took the bullet .0335seconds to travel the distance between the victim's shoulder and the wall. Further, ballistics testing indicates that passing through Leafbottom's shoulder would slow each bullet down to 30% of its initial muzzle velocity. You may reference this information in your final report .

Question

how do you find the speed of the bullet from this im confused 

FBI Firearm Expert Lorenzo Nofingers has provided you with the following table showing estimated muzzle velocities based on the firearms confiscated from the suspects. Investigators on the scene determined that it took the bullet .0335seconds to travel the distance between the victim's shoulder and the wall. Further, ballistics testing indicates that passing through Leafbottom's shoulder would slow each bullet down to 30% of its initial muzzle velocity. You may reference this information in your final report .