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Time and Work

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Question: Worker W produces n units in 5 hours, workers W & V working independently but at same time produces n units in 2 hours. How long would it take V alone to produce n units?

  1. a.
    2 hours 20 minutes
  2. b.
    2 hours 30 minutes
  3. c.
    1 hour 25 minutes
  4. d.
    2 hours 40 minutes
  5. e.
    None of these
Answer: e

Question: Faruk can do a work in 12 days and Salam can do the same work in 8 days. If Faruk, Salam and Babu work together, they can complete the work in 4 days. How many days will it take Babu to complete the work alone?

  1. a.
    16
  2. b.
    20
  3. c.
    24
  4. d.
    32
  5. e.
    None of these
Answer: c

Question: There are two taps in water tank. The first tap pumps water in the tank and the escond one drains it out. The first tap takes 30 minutes to make the tank full and the second tap needs 40 minutes to drain that water out. If both taps are opened at the same time, how long will it take to make a half-full tank?

  1. a.
    1 hour
  2. b.
    40 minutes
  3. c.
    30 minutes
  4. d.
    2 hours
  5. e.
    None of these
Answer: a

Question: Mr. X can finish a work in 6 days and Mr. Y can finish the same work in 8 days. How long will it take to finish the work together?

  1. a.
    7 days
  2. b.
    6 days
  3. c.
    8 days
  4. d.
    24/7 days
  5. e.
    22/7 days
Answer: d

Question: If a car can drive 25 km on two litters of octen, how many litters will be needed for a trip of 150 km?

  1. a.
    12
  2. b.
    3
  3. c.
    6
  4. d.
    7
  5. e.
    10
Answer: a

Question: Working alone Abu can finish a job in 40 days. Labu can do the same job in 60 days working alone. They start working together and work for 18 days. Then Harun joined them. The three men working together finished the job in 5 more days. In how many days could Harun finish the job working alone?

  1. a.
    120
  2. b.
    80
  3. c.
    72
  4. d.
    96
  5. e.
    None of them
Answer: a

Question: If it takes 50 workers 4 hours to dig a hole, how long should it take 30 workers to dig the same hole?

  1. a.
    5 hours 12 minutes
  2. b.
    6 hours 40 minutes
  3. c.
    2 hours 24 minutes
  4. d.
    6 hours 12 minutes
  5. e.
    None of these
Answer: b

Question: A time study specialist has set the production rate for each worker on a job at 22 units every therre hours. At this rate, what is the minimum number of workers that should be put on the job, if at least 90 units are to be produced per hour?

  1. a.
    5
  2. b.
    8
  3. c.
    12
  4. d.
    13
  5. e.
    None of these
Answer: d

Question: A machine produces 1000 units of plastic chair per hour. Working continuously at this rate how many plastic chair will this machine produce in a week?

  1. a.
    7000
  2. b.
    68000
  3. c.
    268000
  4. d.
    168000
  5. e.
    None of these
Answer: d

Question: Some persons can do a pice of work in 12 days. Two times the number of such persons will do half of that work in:

  1. a.
    6 days
  2. b.
    4 days
  3. c.
    3 days
  4. d.
    12 days
Answer: c

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