Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Bot

Question

Two pipes A and B can fill a tank in 15 minutes and 20 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?

Options:

A . 10 min. 20 sec.

B . 11 min. 45 sec.

C . 12 min. 30 sec.

D . 14 min. 40 sec.

Answer: Option D

Part filled in 4 minutes = $4\left(\frac{1}{15}+\frac{1}{20}\right)=\frac{7}{15}.$

Remaining part = $\left(1-\frac{7}{15}\right)=\frac{8}{15}$

Part filled by B in 1 minute = $\frac{1}{20}$

So, $\frac{1}{20}:\frac{8}{15}::1:x$

x = $\left(\frac{8}{15}\times1\times20\right)=10\frac{2}{3}min= 10min.40sec$

So, The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec.

Was this answer helpful ?

Next Question

Submit Solution

More Questions on This Topic :

Question 1. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes,....pipe alone will be able to fill the tank in:

Question 2. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it ta....A and B fill it together for the other half?

Question 3. A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total t....is the total time taken to fill the tank completely?

Question 4. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are ope....one hour each alternately, the tank will be full in:

Question 5. 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....hours taken by C alone to fill the tank is:

Question 6. Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes, and 10 minutes respectively. When t....R in the liquid in the tank after 3 minutes?

Question 7. Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are....are opened together, then the tank will be filled in:

Question 8. A pump can fill a tank with water in 2 hours. Because of a leak, it took $$2\frac{1}{3}$$ hours to fill the tank. The le....leak can drain all the water of the tank in:

Question 9. A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the sam....third pipe. The time required by the first pipe is:

Question 10. Two pipes A and B can fill a cistern in $$37\frac{1}{2}$$ minutes and 45 minutes respectively. Both pipes are opened. Th....half an hour, if the B is turned off after:

Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI

Tabulation - Test Paper 2 Data Interpretation Reasoning & DI

Test Paper 1 Direction Sense Test Reasoning & DI

ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0

GFM Combined 1 Free Revision Test SAIL JO E-0

Submit Solution

More Questions on This Topic :

Latest Videos

Latest Test Papers