Question

49. Pipe P can fill an empty tank in 4 hours but pipe Q can completely empty the same tank
in 8 hours. Both the pipes were opened alternately after every two hours/starting with
pipe P then in how many hours, the tank was completely filled? ​

Answer 1

Answer:

Step-by-step explanation:

Pipe a can empty a filled tank in 28 hrs while pipe B can fill the same tank when empty in 35 hrs if alternately pipes A and B are turned on for an hour each time starting when the tank is full How long will it take to empty

Pipe B can fill in 1- hour= 1/35 of tank. If both pipes alternatively each hour, at the end 2- hours the part of the tank emptied= 1/28- 1/35= (5–4)/140 =1/140. After 135 x 2= (270) hours the part of tank emptied= 135/140 .