I'm having trouble figuring this one out (hopefully I've just been looking at it for too long...)

If a person can jump an max. horizontal distance ( by using a 45degree angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s^{2}. What would be his MAX RANGE on the Moon where free-fall accel. is g/6?

I think I should find the inital velocity first and go from there, but I'm having trouble figuring out how to do that. Any help would be great! (please email)