- Option : D
- Explanation :

Let pipe B be turned off after x minutes.

⇒ x = 16 minutes

You must be logged in to post a comment.

- Option : C
- Explanation :

In a cycle of 3 hours: pipes P, Q and R are working as inlet pipes for 2 hours each and they are working as outlet pipes for an hour each. So part of tank filled in 3 hours.

Thus, tank will be filled in 10th hour.

You must be logged in to post a comment.

You must be logged in to post a comment.

Refer to the data below and answer the questions that follow.

The boiler tank in a chemical factory holds 10^{5} litres.
5 tanks each having one-fifth the capacity of the boiler
tank fill in ‘hard water’ at same rates in the boiler
tank in 2 hours. The outlet of the two of smaller tanks
work as inlet pipes and other two work as outlet and
the fifth tank fill in the main ‘boiler’ at half its efficiency.

- Option : C
- Explanation :

Since 5 tanks of same efficiency fill the boiler in 2 hours each tank individually takes

2 x 5 = 10 hours to fill it.

Tank with half the efficiency will take 10 x 2 = 20 hours.

In one hour, fraction of boiler getting filled when 4 fully efficient pipes with two as inlet and two as outlet and 5th acts at 50% efficiency as an inlet is

Hence it will take 20 hours to fill the boiler tank.

You must be logged in to post a comment.

You must be logged in to post a comment.

Refer to the data below and answer the questions that follow.

The boiler tank in a chemical factory holds 10^{5}; litres. 5 tanks each having one-fifth the capacity of the boiler tank fill in ‘hard water’ at same rates in the boiler tank in 2 hours. The outlet of the two of smaller tanks work as inlet pipes and other two work as outlet and the fifth tank fill in the main ‘boiler’ at half its efficiency.

- Option : C
- Explanation :

Here fraction of tank filled in 1 hour

th of the tank

If they are opened alternately, then tank gets filled in 4 x 3 = 12 hours

Hence half of the tank gets filled in 12/2 = 6 hours.

You must be logged in to post a comment.

You must be logged in to post a comment.

You must be logged in to post a comment.