9 men can do a piece of work in 21 days. The number of men required to complete the same work in 3 days is:
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Correct answer: (D) 63
RRB JE · Mathematics
Time & Work Previous Year Questions
30 Time & Work (Mathematics) questions asked in RRB JE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
- 30 questions
- Official answer key
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Other Mathematics topics
A pipe can fill a tank in 18 hours. Another pipe can empty the filled tank in 21 hours. If both the pipes are opened simultaneously, then the time (in hours) in which the tank will be filled is:
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Correct answer: (A) 126
A and B can do a piece of work in 2 days and 42 days, respectively. The number of days [Correct to one decimal place] required to complete the work if both A and B work together is:
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Correct answer: (A) 1.9
Two taps can fill a cistern in 2 hours and 51 hours respectively. A third tap can empty it in 51 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (D) 2
A and B complete a work in 18 days. If A alone can do it in 54 days then, B alone can do in______________(days).
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Correct answer: (B) 27
Two pipes can fill a tank in 34 hours and 94 hours, respectively. The time (in hours) required to fill the tank when both pipes are opened simultaneously is:
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Correct answer: (C) 799/32
A and B can do a piece of work in 4 days and 46 days, respectively. The number of days [Correct to one decimal place] required to complete the work if both A and B work together is:
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Correct answer: (C) 3.6
Two taps can fill a cistern in 2 hours and 46 hours respectively. A third tap can empty it in 46 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (A) 2
35 men can do a piece of work in 48 days. The number of men required to complete the same work in 21 days is:
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Correct answer: (B) 80
Two taps can fill a cistern in 2 hours and 53 hours respectively. A third tap can empty it in 53 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (A) 2
Two taps can fill a cistern in 2 hours and 45 hours respectively. A third tap can empty it in 45 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (A) 2
A and B can do a piece of work in 8 days and 37 days, respectively. The number of days [Correct to one decimal place] required to complete the work if both A and B work together is:
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Correct answer: (D) 6.5
Two taps can fill a cistern in 2 hours and 47 hours respectively. A third tap can empty it in 47 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (D) 2
Two pipes can fill a tank in 20 hours and 90 hours, respectively. The time (in hours) required to fill the tank when both pipes are opened simultaneously is:
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Correct answer: (D) 180/11
44 men can do a piece of work in 48 days. The number of men required to complete the same work in 8 days is:
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Correct answer: (B) 264
A and B complete a work in 17 days. If A alone can do it in 34 days then, B alone can do in______________(days).
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Correct answer: (C) 34
Two taps can fill a cistern in 2 hours and 54 hours respectively. A third tap can empty it in 54 hours. How long (in hours) will it take to fill the empty cistern, if all of them are opened together?
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Correct answer: (C) 2
50 men can do a piece of work in 12 days. The number of men required to complete the same work in 50 days is:
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Correct answer: (A) 12
A tap can fill a cistern in 32 hours, while another tap can empty the full cistern in 64
hours. If the cistern is initially empty and both taps are opened together, find the time
(in hours) required to fill one-fourth of the cistern.
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Correct answer: (D) 16
A and B can complete a work in 15 days and 10 days, respectively. They started doing
the work together but after 2 days, B had to leave, and A completed the remaining work
alone. The whole work was completed in ______________ days.
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Correct answer: (C) 12
X people were given a contract for doing a piece of work in 18 days. 2 people did not
turn up to work due to sickness, and the rest of the people completed the work in 27
days. What is the value of X?
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Correct answer: (A) 6
P and Q together can fill a cistern with water in 24 hours. If P alone can fill the cistern
with water in 72 hours, then in how many hours will Q alone fill three-fourth of the same
cistern with water?
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Correct answer: (C) 27
Anirudh and Brahmaji are assigned the work of constructing a wall. Anirudh can do the
job in 60 hours alone where as Brahmaji can do the job three times faster. Anirudh
starts the work during the first hour and Brahmaji does the work during the second
hour. During the third hour both do the job simultaneously. If they continue in this
fashion, how long it will take for them to complete the job?
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Correct answer: (C) 23 hours
The internal surface area (in m²) of an open cuboidal tank whose internal length,
internal breadth and internal height are given as 3 m, 11 m, and 9 m, respectively, is:
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Correct answer: (B) 285
Water flows at the rate of 10 m/min from a cylindrical pipe 6 mm in diameter. How long
will it take to fill up a conical vessel whose diameter at the base is 60 cm and depth 21
cm?
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Correct answer: (C) 1 hour, 10 minutes
P and Q together can fill a cistern with water in 24 hours. If P alone can fill the cistern
with water in 96 hours, then in how many hours will Q alone fill three-fourth of the same
cistern with water?
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Correct answer: (C) 24
A and B can complete a work in 15 days and 10 days, respectively. They started doing
the work together but after 4 days, B had to leave, and A completed the remaining work
alone. The entire work was completed in ______________ days.
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Correct answer: (B) 9
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Correct answer: (B) 125
A tap can fill a cistern in 27 hours, while another tap can empty the full cistern in 36
hours. If the cistern is initially empty and both taps are opened together, find the time
(in hours) required to fill one-fourth of the cistern.
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Correct answer: (A) 27
X people were given a contract for doing a piece of work in 32 days. 8 people did not
turn up to work due to sickness, and the rest of the people completed the work in 40
days. What is the value of X?
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Correct answer: (C) 40
How to use these RRB JE Mathematics questions
Every question here was asked in a real RRB JE paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full RRB JE papers as timed tests to check your speed under exam conditions.