Question

Pipes P and Q can fill a tank in 5 and 6 h respectively. Pipe R can empty it in 12 h. If all the three pipes are opened together, then the tank will be filled in :

विकल्प

• `4 5/13` h

• `1 9/17` h

• `3 5/13` h

• `3 9/17` h

Answer 1

`3 9/17` h
Explanation:

Net part fill in 1 h`[1/5+1/6-1/12]=17/60`

⇒ The tank will be full in `60/17 h   i.e.  3 9/17h`