Solve it !!!!!!!!

Rashid Imam (Officer (Indirect taxation))   (296 Points)

22 June 2012  

A swimming pool has four faucets. The first can fill the entire pool with water in two days, the second – in three days, the third – in four days, and the last one can fill the pool in 6 hours.
How long will it take to fill the pool using all 4 faucets together?