One litre of sprite which contain 10% of water is added to 3 litres of sprite which contain 7% of water and to this mixture half a litre of water is added. Find the percentage of water in the final mixture.
A & B alone can do a piece of work in 12 and 16 days respectively. They work for 8days alternately and remaining work is done by C in 5 days.
In how many days C alone can do the work.
The speed of a boat in still water is 11km/hr. It can go 12km upstream and return down stream to the engine point in 2 hours 45 minutes. What is the speed of stream?