CAT Question Bank - Time & Work

  • Number of Questions - 30
    Topic - Time & Work
    Answer key available? - No
    Source - Curated Content

  • Q1) A company has a job to prepare certain number cans and there are three machines A, B and C of this job. A can complete the job in 3 days, B can complete the job in 4 days and C can complete the job in 6 days. How many days the company will take to complete the job if all the machines are used simultaneously ?

  • Q2) A group of men decided to do a job in 8 days. But since 10 men dropped out every day, the job get completed at the end of the 12th day. How many men were there at the beginning ?

  • Q3) 2 men and 3 boys can do a piece of work in 10 days while 3 men and 2 boys can do the same work in 8 days. In how many days can 2 men and 1 boy do the work ?

  • Q4) A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?

  • Q5) X takes 4 days to complete one-third of a job, Y takes 3 days to complete one-sixth of the same work and Z takes 5 days to complete half the job. If all of them work together for 3 days and X and Z quit, how long will it take for Y to complete the remaining work done?

  • Q6) Two men A and B, started a job in which A was thrice as good as B and therefore took 60 days less then B to finish the job. How many days will they take to finish the job, if they start working together ?

  • Q7) The work done by a man, a women and a child are in the ratio 3 : 2 : 1. If daily wages of 20 men, 30 women and 36 children amount to Rs 78. What will be the wages of 15 men, 21 women and 30 children for 18 weeks ?

  • Q8) Three men earn as much as 4 women, 4 women earn as much as 6 boys, and 8 boys earn as much as 10 girls. If a girl earn Rs. 50 a day, then the earning of a man would be

  • Q9) 20 men can do a job in 20 days. After each day, a women is replaced by a man and a man is twice as efficient as a women. On which day does the job get completed ?

  • Q10) A can do a job in 10 days. Due to problematic relationship with B, his efficiency reduces to 60% and both can finish the same job in 10 days. In how many days can B alone do the job ?
    [Given that B’s efficiency remains the same while working alone]

  • Q11) A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is

  • Q12) 12 children take 16 days to complete a work which can be completed by 8 adults in 12 days. 16 adults started working and after 3 days 10 adults left and 4 children joined them. How many days will it take them to complete the remaining work ?

  • Q13) A water tank has three taps A, B and C. A fills 4 buckets in 24 min, B fills 8 buckets in 1 h and C fills 2 buckets in 20 min. If all the taps are opened together, a full tank is emptied in 2 h. If a bucket contains 5L water. What is the capacity of the tank ?

  • Q14) A tap can fill a tank in 25 min and another can empty it in 50 min. Find whether the tank will be filled up or emptied and in how many minutes ?

  • Q15) A pipe can fill a tank in 6 h. Due to leak in the bottom it is filled in 8 h. If the tank is full, how much time will the leak take to empty it ?

  • Q16) Two pipes A and B can fill a cistern in 24 min and 30 min respectively. There is also an outlet C. If all the three pipes are opened together, the tank is full in 20 min. How much time will be taken by C to empty the full tank ?

  • Q17) A cistern can be filled by two pipes in 30 and 40 min respectively. Both the pipes were opened at once, when the first pipe must be turned of so that may be just filled in 18 min.

  • Q18) One filling pipe ‘A’ is 6 times faster than second filling pipe B. If B can fill a cistern in 28 min, then find the time when the cistern will be full if both the pipes are opened together

  • Q19) Two pipes can fill a cistern in 30 and 15 h respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom, 5 h extra are taken for the cistern to be filled up. If the cistern is full, in what time would the leak empty it ?

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