Saturday, July 4, 2015

#Solve #Puzzle

Two pipes can fill a tank in 10hours and 12 hours respectively while a third, pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time will the tank be filled?
(1) 8 hrs 30 min                 
(2) 7 hrs 30 min
(3) 8  hrs 38 min                

(4) 7 hrs 38 min