I think it's for all intents and purposes impossible. It's just too much of a difference. India would need to score like 400 and WI 0.Hmm,i just had a look at the points table,if WI get hammered by India couldn't bangladesh still qualify.
West Indies 5 3 2 0 0 6 +1.650 1111/212.2 870/242.5
Bangladesh 6 3 3 0 0 6 -1.361 1017/290.2 1276/262.2
Very long shot,but if they get bowled out for 50 or sumthing like bangladesh did.