Pipes and Cisterns

Question 11

Two friends A and B decided to work together and fill a pool of capacity 1000 liters. Using a bucket each, A fills at the rate of 4 liters every 3 minutes and B fills at 3 liters every 4 minute. What would be the total time required to fill the pool, given that they take a break of 3 minutes each time both of them put a bucket into the pool at the same instant ?

• 6 hours
• 10 hours
• 8 hours
• 9 hours 57 minutes

Question 12

Two taps A and B can fill a tank in 10 hours and 15 hours respectively. If both the taps are opened together, the tank will be full in ?

• 5 hr
• 6 hr
• 4 hr
• 3 hr

Question 13

To fill a cistern, pipes A, B and C take 15 minutes, 12 minute and 10 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:

• 5 min

• 7 min

• 4 min

• 6 min

Question 14

Two pipes can fill a tank in 10 hours and 12 hours respectively, while third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time the tank will be filled?

• 7 hr. 30 min.

• 7 hr. 25 min

• 7 hr. 40 min

• 7 hr. 50 min

Question 15

A cistern can be filled in 9 hours but it takes 10 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

• 60 hr
• 50 hr
• 80 hr
• 90 hr