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- 41. A cistern can be filled by 3 pipes in 30, 40 and 60 min and emptied by an escape pipe in half an hour the 3 taps are turned on at noon but the escape pipe is at the same time accidentally left open and not closed for a quarter of an hour at what time will the cistern be full?
A.60 min
B.90 min
C.120 min
D.150 min
Answer & Explanation
Answer: Option C 
Let the total time be x min
x/30 + x/40 + x/60 – x/15 = 1
=> x = 120 min
View Answer
- 42. A machine P completes a certain amount of work in 12 hrs and machine Q completes the same work in x hrs if both machines works together to complete the same work in 8 hrs then what is x?
A.12 hrs
B.18 hrs
C.24 hrs
D.32 hrs
Answer & Explanation
Answer: Option C
P’s 1hr work = 1/12
Q’s 1 hr work = 1/x
(A+B)’s 1 hr work = 1/8 = 1/12+1/x
=> x = 24 hrs
View Answer
- 43. 2 pipes P1 and P2 together can fill a tank in 6 hrs and P3 alone can fill the tank in 10 hrs if they work together what is the time taken to fill the tank?
A.7/4 hrs
B.9/4 hrs
C.13/4 hrs
D.15/4 hrs
Answer & Explanation
Answer: Option D
(P1 +P2) can fill 1/6 tank in 1 hr
P3 can fill 1/10 tank in 1 hr
(P1+P2+P3) can fill tank (1/6+1/10)= 4/15
=>3 pipes can fill the tank in 15/4 hrs
View Answer
- 44. If it takes a hrs for x to repair 1 machine and b hrs for y to repair 1 machine then how many hrs will they take to repair 750 machines if they work together?
A.750 × ab/(a+b)
B.750 (a+b)/ab
C.750 ab
D.750/(a+b)
Answer & Explanation
Answer: Option A
x repair machine in a hrs he work 1/a for 1 hr
y repairs machine in b hrs he works 1/b for 1 hr
(x+y) work per 1 hr = 1/a+1/b= (a+b)/ab
time = ab/(a+b)
for 750 machines time = 750 × ab/(a+b)
View Answer
- 45. James can finish a job in 20 dasy he worked for 10 days alone and completed the remaining part working with David 2 days how many days would both David and James together take to complete the entire job?
A.4
B.5
C.10
D.12
Answer & Explanation
Answer: Option A
James and David complete half work in 2 days
=> they can complete whole work in 4 days
View Answer
To whom this Time and Work Questions and Answers section is beneficial?
Students can learn and improve on their skillset for using Verbal Ability effectively and can also prepare for competitive examinations like...
- All I.B.P.S and Public Sector Bank Competitive Exam
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- Career Aptitude Test (IT Companies) and etc.