I have been trying to solve this problem , but so far, I don't know how to use the information I have. In other words , I don't know how to set up this problem!

If muzzle velocity of a rifle is 300 feet per second , at what angle of elevation( in radians) should it be aimed for the bullet to hit a target 2500 feet away?

any help would be good because I'm a little lost. Thanks in advance