LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
13 views
in Aptitude by (30.0k points)
closed by
Two pipes can fill a tank in 10 hrs and 20 hrs, respectively. How long will they take to fill up the tank, if they are used together?
1. 6 hrs 35 min
2. 6 hrs 30 min
3. 6 hrs 40 min
4. 6 hrs 45 min

1 Answer

0 votes
by (53.7k points)
selected by
 
Best answer
Correct Answer - Option 3 : 6 hrs 40 min

Given 

1st pipe can fill the tank = 10 hrs 

2nd pipe can fill a tank = 20 hrs 

Formula Used 

Work = Efficiency × Time

Calculation 

LCM of (10, 20) = 20

Let the work be 20x 

Efficiency of 1st pipe = 20x/10 = 2x/hr

Efficiency of 2nd pipe = 20x/20 = x/hr 

Total time by both working together to fill the tank = 20x/(3x) = 6 hr 40 minutes 

∴ The total taken by both working together to fill the tank is 6 hr 40 minutes

 

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...