Question

It takes 20 minutes for pipe A to fill the tank completely and it takes 30 minutes for pipe B to fill the tank completely. If both the inlets are opened together, then how much time will be taken to fill the tank completely? ​

Answer 1

Answer:

12 minutes

Step-by-step explanation:

A and B take 20 and 30 minutes to fill the tank respectively.

So the work they complete per minute is (1/20)th and (1/30)th respectively.

Together, they would complete (1/20) + (1/30) of the work.

= (3/60) + (2/60)

= 5/60

= 1/12th

Since they complete 1/12 of the work together, they will require 12 mins to complete the work.

Answer 2

Answer:

• A to Fill = 20 minutes
• B to Fill = 30 minutes

• According to the Question :

⇒ To Fill = (A × B) / (A + B)

⇒ To Fill = (20 × 30) / (20 + 30)

⇒ To Fill = 600 / 50

⇒ To Fill = 12 minutes