Mouthwash

The values I have are 1000, 2000, 800 and 1600. To do 2000 I just need to double your results to be 2352.94 for green and whatever the twice 6666.6 recurring is for red, right? (Is it possible to double a recurring number? It's shockingly hard to find that out.) But I'd like to know the values for 800 and 1600. Not really up to doing this myself, sorry.

Every second, a green marble has a chance to appear. You are not told what the probability of this occurring is - instead, you are given a number which is equal to the average number of seconds it takes for a green marble to appear (let's call it 'mean time to happen'). Now let's say you want there to be a chance of a red marble appearing instead of a green one. In order to make this happen, you must define a separate 'mean time to happen' for the red marbles. But you do not want to change the overall chance of any marble to appear; the combined probability of a red or green marble appearing must be the same as the previous probability of a green one appearing. Aim at, say, a fifteen percent probability of a red marble appearing instead of a green one, with the current 'mean time to happen' being one thousand seconds. What 'mean times to happen' would you have to assign to both green and red?