Help plzzz with horizontal velocity

1. The problem statement, all variables and given/known data
Ms. Rob launches a rocket from the school roof at an angle of 45 degrees and observes it’s horizontal range. What other angle could she launch the rocket so that it lands in the same spot, ignoring air resistance?

2. Relevant equations
V=d/t
D=v/t
D=1/2gt^2
V=gt
A^2+b^2+c^2

3. The attempt at a solution

I just can’t get it at all I’m getting really frustrated and it’s due Friday! 😧😟😟😰😭😪😥:cry::frown:
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

http://ift.tt/1f8MCUO

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