Jack, John and Jill go up the hill with five empty pails to a place where three springs are. Each of the five pails has an 8 litre capacity. One of the springs gives 2 litres of water in one minute while each of the other two gives 1 litre of water in one minute. It is impossible to use one spring to fill two pails at the same time, and it takes less than 2 minutes but more than 1 minute to take a pail from one spring to another one. What ist eh shortest time Jack, John and Jill need to fill all five pails to their capacity?

Can someone please help? The answer 12 minutes is wrong, I have to find a shorter time.