Calculating Time for Falling Crate in Projectile Motion

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bringme2life
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This is my first post here so please bear with me if I'm doing something wrong

Homework Statement



A cargo plane is flying horizontally at an altitude of 10.1 km with a speed of 910 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.) How long does it take the crate to hit the ground?

I converted everything to meters.

Yf = 0m
Yi = 10100m
Yxi = 252.78 m/s
g = -9.81 m/s

Homework Equations



Xf = Xi + Vxi*t
Yf = Yi + Vyi*t - 4.905(t)^2

The Attempt at a Solution



My problem is figuring out Vyi in this case so that I can plug it into my second equation to solve for time. Can anyone give me a push in the right direction?
 
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