Time & Work / Pipes & Cisterns
JKSSB Sub-Inspector (Telecommunication) · Basic Numeracy · 35 practice questions with answers and explanations: 12 Easy, 11 Medium, 12 Hard.
Sample questions
Sample Easy question 1
A can complete a task in 10 days. If B is twice as efficient as A, how many days will B take alone?
- 4 days
- 5 days
- 6 days
- 8 days
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Answer: B. Twice as efficient means half the time: 10/2 = 5 days.
Sample Medium question 2
Pipe A fills a tank in 6 hours, pipe B empties it in 12 hours. If both are opened together, how long will it take to fill the tank?
- 10 hrs
- 11 hrs
- 12 hrs
- 14 hrs
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Answer: C. Net rate = 1/6 - 1/12 = 1/12, so the tank fills in 12 hours.
Sample Hard question 3
A tank has two inlet pipes that can fill it in 10 and 15 minutes respectively, and an outlet pipe that can empty it in 24 minutes. If all three are opened together, find the time to fill the tank.
- 6 minutes
- 7 minutes
- 8 minutes
- 9 minutes
Show answer
Answer: C. Net rate = 1/10 + 1/15 - 1/24 = 12/120 + 8/120 - 5/120 = 15/120 = 1/8, so the tank fills in 8 minutes.
More Basic Numeracy topics for JKSSB Sub-Inspector (Telecommunication)
- Algebra
- Average
- Data Interpretation
- Geometry
- Height & Distance
- Mensuration
- Mixture & Alligation
- Number System
- Percentage
- Profit/Loss & Discount
- Ratio & Proportion
- Simple & Compound Interest
- Simplification & Approximation
- Time, Speed & Distance
- Trigonometry