A helicopter problem!

1. The problem statement, all variables and given/known data
A helicopter drops an inflatable raft to flood victims floating in a lake. When the raft is released the helicopter is 50 m directly above the victims and flying at a velocity of 10 m/s at an angle of 30 degrees below the horizontal. Neglect air resistance.
a. How long is the package in the air?
b. How far from the victims does the raft land?
c. Assuming the helicopter drops the package at coordinates (0,0). If the helicopter continues to fly at a constant velocity, where is the helicopter when the package lands?

I think the fact that the helicopter is moving is confusing me. Wouldn't you use the formula y=y_o+v_oysin(angle)(t)-(1/2)gt^2 ?? So you find the time? And then you could use v_y=v_oy-gt to find the velocity? I am not sure how to find c. Please help!

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