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 Time and Work Questions

Popular Latest Rated Important Formulae

FACTS  AND  FORMULAE  FOR  TIME  AND  WORK  QUESTIONS

 

 

1. If A can do a piece of work in n days, then A's 1 day's work =1n

2. If A’s 1 day's work =1n, then A can finish the work in n days.

 

3. A is thrice as good a workman as B, then:

Ratio of work done by A and B = 3 : 1.

Ratio of times taken by A and B to finish a work = 1 : 3.

 

NOTE : 

Efficiency∝1No of time units

 

∴ Efficiency × Time = Constant Work

 

Hence, Required time = WorkEfficiency

 

Whole work is always considered as 1, in terms of fraction and 100% , in terms of percentage.

In general, number of day's or hours = 100Efficiency

Q:

A work can be completed by 18 boys in 24 days. If 6 boys leave after working for 12 days, then how many days will be needed to complete the remaining work?

 

A) 12 B) 15
C) 18 D) 24
 
Answer & Explanation Answer: C) 18

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2 948
Q:

A and B can complete a task in 20 days, B and C can complete it in 30 days while C and A can do the same task together in 24 days. How many days will each of and C take to complete the task individually? 

 

A) 50 and 54  B) 54 and 72 
C) 48 and 80  D) 56 and 64
 
Answer & Explanation Answer: C) 48 and 80 

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4 945
Q:

If A alone can do a job in 40 days then, in how many days can B alone do the job if together they can do the job in 8 days?

A) 15 B) 10
C) 20 D) 25
 
Answer & Explanation Answer: B) 10

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1 944
Q:

Rahul can complete a work in 18 days and Sonu can complete the same work in 15 days. If both together work for 5 days, then what part of total work is left?

 

A) 7/15 B) 11/18
C) 7/18 D) 8/15
 
Answer & Explanation Answer: C) 7/18

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0 932
Q:

A man engaged a servant on a condition that he would pay him Rs. 80 and a pair of jeans after service of one year. Servant served for only 9 months and receives a pair of jeans and an amount of Rs. 55. The price of the jeans is ________.

 

A) Rs. 80   B) Rs. 60
C) Rs. 40 D) Rs. 20
 
Answer & Explanation Answer: D) Rs. 20

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3 926
Q:

If 7 spiders make 7 webs in 7 days , then 1 spider will make 1 web in how many days ?

A) 1 B) 7/2
C) 7 D) 49
 
Answer & Explanation Answer: C) 7

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1 923
Q:

Atul and Binay together complete a piece of work in 5 days. If Binay alone can complete the same work in 8 days, how many days Atul take to complete the same work alone?

A) 40/3 days B) 20/3 days
C) 9 days D) 10 days
 
Answer & Explanation Answer: A) 40/3 days

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2 907
Q:

In a factory, 60 workers can stitch 120 m of clothes in 7 days, what length of clothes can be stitched by 70 workers in 5 days?

 

A) 100 m B) 90 m
C) 85 m D) 110 m
 
Answer & Explanation Answer: A) 100 m

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0 902