MEDIUM
8th Foundation
IMPORTANT
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A tank has two inlet pipes, A and B, which can fill the tank in 12 h and 18 h, respectively, and an outlet C which can empty the tank in 9 h. A, B and C are all open at a time, but the outlet C is blocked completely after 6 h. Find the total time taken right from the start to fill the tank.

Important Questions on Time and Work, Pipes and Cisterns

MEDIUM
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 34
A, B and C can do a work in 20,45 and 120 days, respectively. They started the work. A left 10 days before and B left  5 days before the completion of work. In how many days is the total work completed?(in days).
MEDIUM
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 35
Two pipes P and Q can fill a cistern in 15 min and 20 min, respectively. Both are opened together, but at the end of 5 min,  the pipe P is turned off. How long will the pipe Q take to fill the cistern?
EASY
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 36
A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In how many days can they do it, all working together?
EASY
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 37
A garrison of 2000 men is provisioned for 15 weeks at the rate of 1.5 kg per day per man. How many men must leave so that the same provisions may last for 30 weeks at1  kg per day?
EASY
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 38
A garrison had provisions for 1500 men for 30 days. After some days, 300 more men joined the garrison. The provisions lasted for a total of 26 days from the beginning. After how many days did the new men join?
EASY
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 39
A and B can do a work in 12 days and 17 days,  respectively, and with the help of C they complete the work in 5 days and earn ₹238. Find the share of B.
EASY
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 40
 A and B can do a work in 30 days and 10 days, respectively. If they work on alternate days beginning with A, in how many days will the work be completed?
MEDIUM
8th Foundation
IMPORTANT
Pearson IIT Foundation Mathematics Class 8>Chapter 8 - Time and Work, Pipes and Cisterns>PRACTICE QUESTIONS CLASSROOM WING>Q 41
A boy and his mother together can do a piece of work in 24 days, whereas the boy, working with his father, can complete it in 18 days. If the mother and father together take 36 days to complete the same work, then find the time in which they can complete the work if all the three work together. Also, find the time they would take to complete the job, if they work individually.