Question
Pipe A and Pipe B could fill a tank together in 40 hours
and 16 hours respectively, while pipe C could empty it in 20 hours. If both inlet pipes are opened together for first 4 hours, then pipe C replaced them. Find the time taken by pipe C to empty the tank filled by pipe A and pipe B together.Solution
Let the capacity of the tank be 80 units. (LCM of 40, 16 and 20)
Efficiency of pipe A = 80/40 = 2 units/hr
Efficiency of pipe B = 80/16 = 5 units/hr
Efficiency of pipe C = 80/20 = –4 units/hr ATQ,
Tank filled by pipe A and B together in 4 hours = (2 + 5) × 4 = 28 units
Required time = 28/4 = 7 hr
Statement : Some letters are alphabets.
All alphabets are words.
Some letters are consonants.
Conclusion : I. All letters being...
In each of the questions below are given three statements followed by two conclusions numbered I and II. You have to take the given statements to be ...
Statement:Â
All beds are cupboards.
Some beds are tables.
Some tables are pillows.
Conclusion:
I. Some cupboards are...
In the question below there are two conclusions followed by three statements in the options. You have to take the three given statements to be true ev...
Statements:
No Summer is Winter.
Only a few Winter is Autumn
Some Summer are Spring.
Conclusions:
I. All W...
Statements:Â
Only a few Twitter are Meta.
Some Meta are Tiktok.
No Tiktok is Instagram.
Conclusions:
I. Some Twi...
Direction: In the given question a statement is followed by two conclusions numbered I and II. You have to assume everything in the statement to be tru...
Statements:
Some schools are hospitals
Mostly hospitals are courts
Some courts are parlours
Conclusions:
I...
In the question below there are three statements followed by three conclusions I, II and III. You have to take the four given statements to be true eve...
, In the question below some statements are given followed by two conclusions I and II. You have to take the given statements to be true even if they s...
Relevant for Exams:
