Your numbers need dimensions. Are they in meters? Is the 2.30 in centimeters? Do you want the bullet speed in m/s?
For the flight time, figure out how long it takes a dropped object to fall 2.30 whatevers.
A rifle is aimed horizontally at a target 46.0away. The bullet hits the target 2.30 below the aim point.
What is the bullet's flight time?
What is the velocity as it leaves the barrel?
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