Bank Exam Speed Maths Master Series – Page 11

Time & Work Tricks & Fast Calculation Methods

Shaktimatha Learning – Speed Maths Academy
Learn Time & Work shortcut tricks, aptitude formulas, and fast calculation methods for Bank Exams, SSC, Railways, Insurance, and Competitive Exams.

Importance of Time & Work in Competitive Exams

Time & Work is one of the most important topics in:

Bank Exams
SSC
Railway Exams
Insurance Exams
Quantitative Aptitude

This topic is highly useful in:

Efficiency problems
Partnership
Pipes & Cisterns
Work distribution
Data Interpretation

🎯 Basic Concept of Time & Work

If a person completes work in:

Fewer days → More efficiency
More days → Less efficiency

Basic Work Formula

0

Efficiency Formula

1

Trick 1: Unit Work Method

If a person completes a work in:

10 days

Then one day work:

2

Example:

A completes work in 20 days.

One day work:

1/20

✅ Efficiency = 1/20

Trick 2: Combined Work Formula

If:

A completes work in x days
B completes work in y days

Then together:

3

Example:

A = 10 days
B = 15 days

Together:

(10×15)/(10+15)

150/25

✅ Answer = 6 days

Trick 3: Work Ratio Method

If:

A:B = 2:3

Then: Time ratio becomes inverse.

Time ratio: 3:2

More efficiency → Less time

Trick 4: Men & Days Relation

Formula:

4

Example:

10 men complete work in 20 days.

20 men complete work in:

10×20 = 20×x

200 = 20x

✅ Answer = 10 days

Trick 5: Pipes & Cistern Shortcut

If:

Pipe A fills tank in x hours
Pipe B fills tank in y hours

Together:

5

Same as Time & Work formula.

Example:

Pipe A = 12 hours
Pipe B = 18 hours

Together:

(12×18)/(12+18)

216/30

✅ Answer = 7.2 hours

Trick 6: Efficiency Comparison

If:

A is twice as efficient as B

Then:

A:B efficiency = 2:1
Time ratio = 1:2

Important Observation Trick

Efficiency and time are inversely proportional.

Formula:

6

Important Time & Work Shortcuts

Topic	Shortcut
One day work	1/Total days
Combined work	xy/(x+y)
Men & Days	Constant work
Efficiency	Work/Time
Time Ratio	Inverse of efficiency

Practice Questions

A completes work in 12 days. Find one-day work
A = 10 days, B = 15 days, together = ?
15 men complete work in 8 days. How many days for 10 men?
Pipe A fills tank in 6 hours and Pipe B in 12 hours. Together = ?
If A:B efficiency = 3:2, find time ratio

✅ Answers

1/12
6 days
12 days
4 hours
2:3

🎯 Preparation Strategy:
Practice unit work methods, combined work shortcuts, efficiency relations, and pipes & cistern formulas daily to improve aptitude speed and logical calculation ability.

“Smart Work Formulas Simplify Even the Toughest Aptitude Problems.”

MIND GROW Magazine

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