Math, asked by snakeeye86, 8 months ago

12. Two persons A and B together can build a wall in 12 days: persons B and C working together
can do it in 10 days; persons C and A together can do it in 15 days.
In what time, working together, they will finish the work?
m) in what time, working alone, each of them can do the same work?

Answers

Answered by Anonymous

Answer:

A can do a piece of work in 10 days, and B can do the same work in 20 days. With the help of C, they finished the work in 4 days. C can do the work in how many days, working alone? Explanation:Their combined 4 day work = 4(1/10 + 1/15) = 12/20 = 3/5.

Answered by Tyagibhai1979

Answer:

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40 Time and Work Questions for CAT with Answers

Time and work CAT questions

In CAT, Time and Work questions have become important, as a result of the rise in the number of questions from arithmetic. There are many shortcut formulas and tricks, which are frequently used to solve CAT Time and Work questions in quick time. Alternatively, Time and Work problems can easily be solved by the concept of the LCM method.

Questions from Pipes and Cisterns also fall under Time and Work as the concept requires to solve such questions is the same as the concepts used to solve Time and Work Questions.

To apply the concepts to solve CAT problems on Time and Work, an aspirant must be good at Ratio & Proportion and Percentages. As the level of difficulty of the questions varies a lot, it is advisable to follow the below tips to construct a proper approach to Time and Work questions for CAT exam.

Time and Work Tips to solve CAT questions:

Assume the work to be the LCM of the numerical values given in the question.

Get the one unit work for each of the participants who are mentioned in the question and are supposed to complete the work.

Often the concepts of ratio and proportion are helpful in simplifying the complex calculations.

If the options are provided, try testing the options backwards. The option which agrees with the conditions given in the question should be the right answer.

To give you ample practice, we have provided around 40 questions on Time and Work. These questions are of varied difficulty level. These Time and Work questions are divided into 8 practice exercises. The links of all these exercises are given at the bottom.

Question 1:

A work was completed by three persons of equal ability, first one doing m hours for m days, second one doing n hours for n days (m and n being integers) and third one doing 16 hours for 16 days. The work could have been completed in 29 days by third person alone with his respective working hours. If all of them do the work together with their respective working hours, then they can complete it in about

[1] 12 days

[2] 13 days

[3] 14 days

[4] 15 days

Question 2:

Three labourers worked together for 30 days, in the course of work, all of them remained absent for few days. One of them was absent for 10 days more than the second labourer and the third labourer did one-third of the total work. How many days more than the third labourer was the first one absent?

[1] 4

[2] 5

[3] 6

[4] cannot be determined

Question 3:

A and B do a work in exactly 16 days, B and C do the same work in exactly 12 days while C and A do the same work in about 10 days. If A, B and C can together do the work in integral number of days, then C does the work alone in

[1] 15 days

[2] 16 days

[3] 18 days

[4] none of these

Question 4:

Two persons A and B can do a work alone in 29 days. A takes the rest of one day after every 4 days and B takes the rest of one day after every 5 days. If A and B starts working together, then the work will be completed on

[1] 15th day

[2] 16th day

[3] 17th day

[4] 18th day

Question 5:

Works W1 and W2 are done by two persons A and B. A takes 80% more time to do the work W1 alone than he takes to do it together with B. How much percent more time B will take to do the work W2 alone than he takes to do it together with A?

[1] 100%

[2] 120%

[3] 125%

[4] can not be determined

Time and Work

Time and Work Questions Set 1Time and Work Questions Set 2Time and Work Questions Set 3Time and Work Questions Set 4Time and Work Questions Set 5Time and Work Questions Set 6Time and Work Questions Set 7Time and Work Questions Set 8

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12. Two persons A and B together can build a wall in 12 days: persons B and C working togethercan do it in 10 days; persons C and A together can do it in 15 days.In what time, working together, they will finish the work?m) in what time, working alone, each of them can do the same work?​

Answers

12. Two persons A and B together can build a wall in 12 days: persons B and C working together
can do it in 10 days; persons C and A together can do it in 15 days.
In what time, working together, they will finish the work?
m) in what time, working alone, each of them can do the same work?