So think further:
If the cloud is 1km high, the upper raindrops got more time to fall and to grow, what makes them bigger and also slower.
That means:
The little raindrops are faster and closer to earth and reach the ground first. Then the big ones. And at last a Boing 747, cause its even bigger and flies higher than this little stupid raindrops.

cu Lutz (just call me Einstein) *ggg*