Individual distance between water droplets

[Remenission]

Homework Statement

Question: Drops of water fall from the roof of a building 16m high at regular intervals of time, the first drop reaching the ground at the same instant that the fifth drop starts to fall. Find the distance between te individual drops in the air a the instant the first drop reaches the ground.

So we have:
$$\Delta$$ y = 16m
a = 9.8 m/s^-2

2. The attempt at a solution
I've worked out the total time to be 1.806 s for the first drop to reach the floor through:
$$\Delta$$y = U_y.t + 1/2 a.t^2
16 = 0 + 4.9t^2
t = 1.807s

I've also tried finding 1/5th of the the time, then 2/5th's and so on, then using that time to get the distance and then finding the resulting distance from the last drop...

I've been trying all day to get the distance between each individual drop... The answers are 7m, 5m, 3m, 1m.

 

[gneill]

There are five drops, but how many intervals are there that separate them?