Question

Let us wait. The rain stop (until)

Answer 1

Answer:

Its difficult to give an exact figure as the height at which raindrops fall and their size vary widely, but given that raindrops fall at an average speed of around 14 mph and assuming a cloud base height of around 2,500 feet, a raindrop would take just over 2 minutes to reach the ground.

Explanation:

Answer 2

Answer:

let us wait until the rain stop

Explanation:

I think it is kind of English grammar ,joining sentences.so I figured out this .