Projectile motion questiondon't understand about angles and vectors

[hamsterpower7]

Homework Statement

Giancoli 5th edition chapter 3 problem 38

a rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below
the plane is traveling horizontally with a speed of 69.4m/s
b) supposes, instead that the plane releases the supplies a horizontal distance of 425m in advance of the moutain climbers. What vertical velocity should the supplies be given so that they arrive precisely at the climbers position?

The Attempt at a Solution

I attempted it several times using two different method
the second time was using

X = V_0 t
t= 6.12s

so then
y =y_0 + V_0t + 1/2 a_y (t^2)

answer was 8.41m/s


but then my question is that
for my first attempt at this question
I try to figure out the angle if they threw it upward or downward
but why does that angle not matter for the vertical or horizontal velocity?

 

[hamsterpower7]

O DUDE
I reread the question and it said it only gave vertical velocity
thats why
okay no need for help now
thx