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Time & Work – Core Concept for Efficiency Problems

Quantitative Aptitude – Time & Work

Time and Work is a high-weightage topic in bank exams. It deals with efficiency, work rate, and time taken to complete tasks. Understanding this concept helps solve problems quickly.

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Basic Concept

Work = Time × Efficiency

Efficiency means how much work is done in one unit of time.

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Important Formulas

  • If A completes work in x days → 1 day work = 1/x
  • Total work = LCM of given times
  • Combined work = Sum of individual work rates
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Shortcut Tricks

1. LCM Method

If A takes 10 days and B takes 15 days LCM = 30 units A’s work/day = 3 units B’s work/day = 2 units Together = 5 units/day Time = 30 / 5 = 6 days

2. Efficiency Concept

If A is twice as efficient as B Then A:B = 2:1 Time ratio = 1:2

3. Work Rate Addition

(A + B) = A’s one day work + B’s one day work

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Practice Questions

Q1. A can complete work in 10 days. Find 1 day work
Answer: 1/10

Q2. A can do a work in 10 days and B in 20 days. How long together?
Answer: 6.67 days

Q3. If A is twice as efficient as B and B takes 12 days, find A’s time
Answer: 6 days

Q4. A and B together complete work in 8 days. If A alone takes 12 days, find B’s time
Answer: 24 days

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Speed Strategy

  • Use LCM method for faster solving
  • Convert time into work units
  • Focus on efficiency instead of time
  • Avoid complex fractions
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Practice Task

1. A can do work in 8 days, B in 16 days. Find together time
2. If A:B efficiency = 3:2, find time ratio
3. A and B complete work in 12 days. A alone takes 20 days. Find B’s time

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