(Sample Material) India Post Payments Bank (IPPB) Study Kit "Numerical Ability - Time and Work"
Sample Materials of India Post Payments Bank (IPPB) Study Kit
Subject: Numerical Ability
Topic: Time and Work
1. A tap can fill a cistern in 12 h. After half the tank is filled, 2 more similar taps are opened. What is the total time taken to fill the tank complete by?
(1) 9 h
(2) 6 h
(3) 8 h
(4) 4 h
(5) None of these
2. An electric pump can fill a reservoir in 36 h. Because of a leak in the reservoir it took 45 h to fill the reservoir. When the reservoir is full, how much time will the leak take to empty it?
(1) 180 h
(2) 175 h
(3) 185 h
(4) 170 h
(5) None of these
3. A cistern has three pipes A, B and C. The pipes A and B can fill it in 5 h and 6 h respectively and C can empty it in 3 h. If the pipes are opened in order at 3 pm, 4 pm and 5 pin respectively at what time will the tank be filled?
(1) 6 am
(2) 5 am
(3) 4 am
(4) 7 am
(5) None of these
4. A cistern has a leak which would empty it in 10 h. A tap is turned on which admits 4 L a minute into the cistern and it is now emptied in 15 h. How many litres does the cistern hold?
(1) 7400 L
(2) 7200 L
(3) 7100 L
(4) 7500 L
(5) None of these
5. In what time would a cistern be filled by two pipes whose diameters are 1 cm and 3 cm respectively running together when the larger alone will fill it in 40 min, the amount of water flowing in by each pipe being proportional to the square of its diameter?
(1) 32 min
(2) 36 min
(3) 33 min
(4) 34 min
(5) None of these
