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Work Time question are very important for most of the exam specially in banking exam. There are always few question related to work time in the Bank, IBPS, SBI PO clerk exams and you can expect those to asked again in upcoming exams
We have listed some very important tip and tricks for solving work time Question in quick way. Also there are important Work time question for practicing. Please try these question thoroughly and practice as much question you can.
Tips to Solve Work Time Question Fast:
Use Efficiency method to Solve work time Questions:
Please check below example
Next Example: A takes 8 day to finish a piece of work. B takes 10 days to finish the same work. C takes 20 days to finish the work. D takes 40 days to finish the work. How long will it take to finish the work when all of them are working together?
Answer: Try yourself first and then check
Case 1 – A does a work in X days, B does a Work in Y days In how many days they will complete the work.
Question- A completes the work in 10 days and B completes the work in 15 days In how many days they will complete the work.
Efficiency method.
Efficiency of A =100/10 = 10%
Efficiency of B = 100/15 = 6.66%
Efficiency of A & B Together = 10+ 6.66 = 16.66%
So the time taken by A & B together to Complete the work will be 100/16.66 = 6 Days.
Efficienecy Method
A’s Efficiency = 10%
B’s Efficiency = 6.66%
A + B Efficiency = 16.66%
Work done by A and B in 2 days [ Remember 2 days because they are not working together but working alternatively] = 16.66%
So time taken by them to complete 100% work = 100/(16.66 = 6 [ but always remember multiply this by 2, Because 16.66% work is done by them in 2 days and not in 1 day.
Answer will be 6*2 = 12 days.
Efficiency method
A’s efficiency = 10%
B’s Efficiency = 6.66%
Total a+b = 16.66%
Work done by A and B together in 2 days = 16.66*2 = 33.33%
Work remaining = 66.66%
Time taken by B to complete 66.66% work = 66.66/6.666 = 10 days
Total time = 10+2 = 12 days
Efficiency method
A’s efficiency = 10%
B’s efficiency = 6.66%
Total = 16.66%
Work will be completed in 6 days
Work done in 4 days = 66.66%
Remaining = 33.33%
A will complete the remaining in = 33.33/10 = 3.33
Total = 4+3.33 = 7.33
Example 1 :
A can do a piece of work in 8 days. B can do the same in 14 days. In how many days can the work be completed if A and B work together?
Solution :
Let us find LCM for the given no. of days “8” and “14”.
L.C.M of (8, 14) = 56
Therefore, total work = 56 units
A can do = 56 / 8 = 7 units/day
B can do = 56 / 14 = 4 units/day
(A + B) can do = 11 units per day
No. of days taken by (A+B) to complete the same work
= 56 / 11 days
Examples
Q1. Ash can do a job in 10 days. Bali can do the same job in 5 days. In how many days they can complete the job if they work together?
Ans: 3.33 days
Solution: Ash can do a job in 10 days,
So efficiency of Ash = 100/10 = 10%
Similarly, Bali’s efficiency = 100/5 = 20%
Combined efficiency of Ash + Bali per day becomes = 20 + 10 = 30%
Now, we have to find out the number of days taken by both Ash and Bali to do 100% work,
Since they can do 30% wok in 1 day,
So, they will 100% work in 100/30 = 3.33 days
NOTE: Efficiencies get added directly!
Q2: A can do a work in 6 days and B can do the same work in 5 days. The contract for the work is Rs 220. How much shall B get if both of them work together?
Shortcut trick : As wages distributed in inverse proportion of number of days, their share should be in the ratio 5:6
B’s share = 220/11 * 6 = 120
Most of the time and work questions can be solved if you know the basic correlation between time, work and man-hours.