CLEAR
Toprankers-Info

+91 7676564400

Mobile App

Get it on Google Play
Discussions
Select Date
Tags:

Articles

Discussions
Submit Discussion
Nikhil verma

· started a discussion

· 1 Months ago

total time= 50 (Question: 113283.0 )

50 nhi hona chahiye ans.

Question:

A pipe can fill a tank in 12 minutes and another pipe is 15 minutes but a third can empty it in 6 minutes. The first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. In what time is the cistern emptied?

Options:
A) 40 minutes
B) 50 minutes
C) 45 minutes
D) 55 minutes
Solution:
Ans: (c) Cistern filled in 5 minutes = \(5\left ( \cfrac{1}{12}+\cfrac{1}{15} \right )=\cfrac{3}{4}\) 

Net work done by 3 pipes in 1 minute=\(\left ( \cfrac{1}{12}+\cfrac{1}{15} \right )-\cfrac{1}{6}=-\cfrac{1}{60}\).

-ve sign shows that \(\cfrac{1}{60}\) part is emptied in minute

\(\therefore\) \(\cfrac{3}{4}\) part is emptied in \(60×\cfrac{3}{4}\) = 45 minutes

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
The given answer is correct.
Please solve carefully .

Thanks and Regards
Team TR
-logo
We at aim to provide most comprehensive content & test for practice which is carefully divided into various chapters and topics to help you focus on your weak areas.Our Practice mock test gives you unmatched analytics to help you realize your strong areas,time management and improvement areas.Our Short & Crisp notes on each topic will help you to quickly revise the topic along with the tips & tricks of the exams.
More About
-Info
-Info

Mobile App

Get it on Google Play
About Us Campus Ambassador Careers Contact Us Refund Policy

All Rights Reserved Top Rankers

User Policy
Disclaimer
Terms & Conditions