Time & Work – Advanced Models + Efficiency Tricks
Solve work problems faster using LCM method and efficiency shortcuts.
🔥 Shortcut Tricks
- Take LCM of days as total work
- Efficiency = Work per day
- Use unit work (1/day)
- Convert ratio into efficiency
Solve in 5 Seconds
Q1: A completes work in 10 days. Work done in 1 day?
Answer: 1/10
Q2: A works twice as fast as B → ratio?
Answer: 2:1
Exam Level Questions
Q3: A = 12 days, B = 18 days. Together?
Shortcut:
LCM = 36
A = 3, B = 2 → total = 5
Time: 36/5 = 7.2 days
Q4: A alone = 10 days, A+B = 6 days. Find B?
Solution:
A = 1/10
A+B = 1/6
B = (1/6 − 1/10) = 1/15
Answer: 15 days
Q5: A = 8 days, B = 12 days. Work together 2 days. Remaining work?
Solution:
LCM = 24
A = 3, B = 2 → total = 5/day
2 days work = 10
Remaining = 14 units
Q6 (Pipes): Pipe A fills in 6 hr, B empties in 8 hr. Time to fill?
Solution:
A = 1/6, B = −1/8
Total = 1/24
Answer: 24 hours
❌ Exam Trap
Q: A and B together take 6 days. If A is faster, find A’s time?
Trap: Cannot determine directly
Reason: Need individual efficiency info
⚡ Speed Booster Tip
Always convert days into efficiency before solving.
Quant • Time & Work • Bank Exam Preparation
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