QUANTITATIVE APTITUDE - PIPES AND CISTERNS SET 03

PIPES AND CISTERNS SET 03

1.Three taps  P,Q and R can fill a tank in 10,20 and 30 hours respectively. If A is open all the time and Q and R are open for one hour each alternatively ,the tank will be fill in
 

A)7 hours    B)7 hours 30min        C)7hours 45min        D)7hours 20 min    E)None of these
 

2. Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
 

A. 6 hours        B. 2 hours        C. 4 hours        D. 3 hours
 

3. Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
 

A. 9 min        B. 8 min        C. 6 min        D. 4 min   
 

4. Two pipes A and B can fill a tank in 15 minutes and 40 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
 

A. 10 min 10 sec       B. 25 min 20 sec        C. 29 min 20 sec      D. 20 min 10 sec   
 

5. Two pipes can fill a tank in 25 and 30 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
 

A. 250 gallons        B. 450 gallons        C. 120 gallons            D. 150 gallons
 

6. A tank is filled in 10 hours by three pipes A, B and C. Pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
 

A. 70 hours        B. 30 hours        C. 35 hours        D. 50 hours
 

7. One pipe can fill a tank four times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in:
 

A. 180 min        B. 144 min.        C. 126 min        D. 114 min
 

8. A tap can fill a tank in 4 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
 

A. 3 hr            B. 1 hr 30 min        C. 2 hr 30 min            D. 2 hr
 

9. A tap can fill a tank in 4 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely?
 

A. 1 hr 20 min            B. 4 hr            C. 3 hr            D. 2 hr 40 min
 

10. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:
 

A. 10        B. 12        C. 14        D. 16
 

Answer Keys:
1.A
2.A
3.B
4.C
5.B
6.A
7.A
8.C
9.D
10.C