Two pipes A and B can fill a tank in 36 min.
and 45 min. respectively. A water pipe C can empty the tank in 30 min. First A
and B are opened. After 7 min, C is also opened. In how much time, the tank is
full?
(1) 39
min
(2) 40 min
(3) 42
min
(4) 38 min
No comments:
Post a Comment