Question

Pipe a empties a tank and pipe b fills the tank.Both the pipes are opened it takes 12 hours to fill the tank.If pipe b takes 3 hours individually to fill the tank then what is the time taken by pipe a to empty the tank

Answer 1

Answer:

Step-by-step explanation:

a+b=12h

3h=b

=>12h=12*b/3

=4b

so,a+b=4b

=>4b-b=a

=>a=3b

As b=3h

=3(3h)

=9h