(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Time and Work

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - 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?

(a) 9 h
(b) 6 h
(c) 8 h
(d) 4 h

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?

(a) 180 h
(b) 175 h
(c) 185 h
(d) 170 h

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?

(a) 6 am
(b) 5 am
(c) 4 am
(d) 7 am

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?

(a) 7400 L
(b) 7200 L
(c) 7100 L
(d) 7500 L

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?

(a) 32 min
(b) 36 min
(c) 33 min
(d) 34 min

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