There are two water tanks A and B, A is much smaller than B. While water fills…

There are two water tanks A and B, A is much smaller than B. While water fills at the rate of one litre every hour in A, it gets filled up like 10, 20, 40, 80, 160…, in tank B. (At the end of the first hour, B has 10 litres, the second hour it has 20, and so on.) If tank B is 1/32 filled after 11 hours, what is the total duration required to fill it completely?