Bank Exam Practice Material Series – Page 7
Time & Work Tricks, Speed Maths & Important Concepts
Learn Time & Work shortcut tricks, efficiency concepts, work calculations, and fast solving techniques for Bank Exams, SSC, Railways, Insurance, and Competitive Exams.
Importance of Time & Work
Time & Work is one of the most important arithmetic topics in competitive exams. This topic helps students improve:
- Logical thinking
- Efficiency calculations
- Problem-solving speed
- Mathematical reasoning
- Calculation accuracy
Important Time & Work Concepts
- Individual Work Efficiency
- Combined Work
- Man Days Concept
- Work Distribution
- Efficiency Ratio
- Alternative Working Method
Basic Work Formula
Combined Work Formula
Speed Tricks for Time & Work
Combined Work Shortcut
A completes work in 10 days.
B completes work in 15 days.
Combined work:
(10 × 15) ÷ (10 + 15)
150 ÷ 25
Answer = 6 days
Efficiency Trick
If A is twice as efficient as B:
Efficiency Ratio:
2 : 1
Time Ratio:
1 : 2
Work Distribution Trick
If 5 workers complete a work in 12 days:
Total work:
5 × 12 = 60 units
Important Efficiency Ratios
| Efficiency Ratio | Time Ratio | Efficiency Ratio | Time Ratio |
|---|---|---|---|
| 1 : 2 | 2 : 1 | 2 : 3 | 3 : 2 |
| 3 : 4 | 4 : 3 | 4 : 5 | 5 : 4 |
| 5 : 6 | 6 : 5 | 6 : 7 | 7 : 6 |
Practice Questions
Question 1
A completes a work in 8 days.
B completes the same work in 12 days.
Find combined work time.
(8 × 12) ÷ (8 + 12)
96 ÷ 20
Answer = 4.8 days
Question 2
If A is 3 times as efficient as B, find efficiency ratio.
Answer = 3 : 1
Question 3
10 workers complete work in 15 days.
Find total work units.
10 × 15
Answer = 150 units
Question 4
A completes work in 20 days.
Find one day work.
2Answer = 1/20
Question 5
A and B complete a work together in 5 days.
Find one day work.
3Answer = 1/5
Important Exam Tips
- Learn efficiency ratios carefully
- Practice combined work formulas regularly
- Convert work into units for easy solving
- Improve calculation speed daily
- Focus on shortcut methods
Fast Formula Revision
| Topic | Formula |
|---|---|
| Work | Time × Efficiency |
| Combined Work | 1/T = 1/x + 1/y |
| Efficiency | Work / Time |
| One Day Work | 1 / Total Days |
| Time Ratio | Inverse of Efficiency Ratio |
Daily Practice Strategy
- Practice 20 Time & Work questions daily
- Revise efficiency ratios regularly
- Practice combined work shortcuts
- Improve approximation speed
- Focus on both speed and accuracy
Bank Exam Practice Material Series
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